[This essay on philosophy was written by Comrade Mao Tse-tung after his essay "On Practice" and with the same object of overcoming the serious error of dogmatist thinking to be found in the Party at the time. Originally delivered as lectures at the Anti-Japanese Military and Political College in Yenan, it was revised by the author on its inclusion in his Selected Works.]

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The criticism to which the idealism of the Deborin school has been subjected in Soviet philosophical circles in recent years has aroused great interest among us. Deborin's idealism has exerted a very bad influence in the Chinese Communist Party, and it cannot be said that the dogmatist thinking in our Party is unrelated to the approach of that school. Our present study of philosophy should therefore have the eradication of dogmatist thinking as its main objective.

Throughout the history of human knowledge, there have been two conceptions concerning the law of development of the universe, the metaphysical conception and the dialectical conception, which form two opposing world outlooks. Lenin said:

Here Lenin was referring to these two different world outlooks.

In China another name for metaphysics is hsuan-hsueh. For a long period in history whether in China or in Europe, this way of thinking, which is part and parcel of the idealist world outlook, occupied a dominant position in human thought. In Europe, the materialism of the bourgeoisie in its early days was also metaphysical. As the social economy of many European countries advanced to the stage of highly developed capitalism, as the forces of production, the class struggle and the sciences developed to a level unprecedented in history, and as the industrial proletariat became the greatest motive force in historical development, there arose the Marxist world outlook of materialist dialectics. Then, in addition to open and barefaced reactionary idealism, vulgar evolutionism emerged among the bourgeoisie to oppose materialist dialectics.

As opposed to the metaphysical world outlook, the world outlook of materialist dialectics holds that in order to understand the development of a thing we should study it internally and in its relations with other things; in other words, the development of things should be seen as their internal and necessary self-movement, while each thing in its movement is interrelated with and interacts on the things around it. The fundamental cause of the development of a thing is not external but internal; it lies in the contradictoriness within the thing. There is internal contradiction in every single thing, hence its motion and development. Contradictoriness within a thing is the fundamental cause of its development, while its interrelations and interactions with other things are secondary causes. Thus materialist dialectics effectively combats the theory of external causes, or of an external motive force, advanced by metaphysical mechanical materialism and vulgar evolutionism. It is evident that purely external causes can only give rise to mechanical motion, that is, to changes in scale or quantity, but cannot explain why things differ qualitatively in thousands of ways and why one thing changes into another. As a matter of fact, even mechanical motion under external force occurs through the internal contradictoriness of things. Simple growth in plants and animals, their quantitative development, is likewise chiefly the result of their internal contradictions. Similarly, social development is due chiefly not to external but to internal causes. Countries with almost the same geographical and climatic conditions display great diversity and unevenness in their development. Moreover, great social changes may take place in one and the same country although its geography and climate remain unchanged. Imperialist Russia changed into the socialist Soviet Union, and feudal Japan, which had locked its doors against the world, changed into imperialist Japan, although no change occurred in the geography and climate of either country. Long dominated by feudalism, China has undergone great changes in the last hundred years and is now changing in the direction of a new China, liberated and-free, and yet no change has occurred in her geography and climate. Changes do take place in the geography and climate of the earth as a whole and in every part of it, but they are insignificant when compared with changes in society; geographical and climatic changes manifest themselves in terms of tens of thousands of years, while social changes manifest themselves in thousands, hundreds or tens of years, and even in a few years or months in times of revolution. According to materialist dialectics, changes in nature are due chiefly to the development of the internal contradictions in nature. Changes in society are due chiefly to the development of the internal contradictions in society, that is, the contradiction between the productive forces and the relations of production, the contradiction between classes and the contradiction between the old and the new; it is the development of these contradictions that pushes society forward and gives the impetus for the supersession of the old society by the new. Does materialist dialectics exclude external causes? Not at all. It holds that external causes are the condition of change and internal causes are the basis of change, and that external causes become operative through internal causes. In a suitable temperature an egg changes into a chicken, but no temperature can change a stone into a chicken, because each has a different basis. There is constant interaction between the peoples of different countries. In the era of capitalism, and especially in the era of imperialism and proletarian revolution, the interaction and mutual impact of different countries in the political, economic and cultural spheres are extremely great. The October Socialist Revolution ushered in a new epoch in world history as well as in Russian history. It exerted influence on internal changes in the other countries in the world and, similarly and in a particularly profound way, on internal changes in China. These changes, however, were effected through the inner laws of development of these countries, China included. In battle, one army is victorious and the other is defeated, both the victory and the defeat are determined by internal causes The one is victorious either because it is strong or because of its competent generalship, the other is vanquished either because it is weak or because of its incompetent generalship; it is through internal causes that external causes become operative. In China in 1927, the defeat of the proletariat by the big bourgeoisie came about through the opportunism then to be found within the Chinese proletariat itself (inside the Chinese Communist Party). When we liquidated this opportunism, the Chinese revolution resumed its advance. Later, the Chinese revolution again suffered severe setbacks at the hands of the enemy, because adventurism had risen within our Party. When we liquidated this adventurism, our cause advanced once again. Thus it can be seen that to lead the revolution to victory, a political party must depend on the correctness of its own political line and the solidity of its own organization.

The dialectical world outlook emerged in ancient times both in China and in Europe. Ancient dialectics, however, had a somewhat spontaneous and naive character; in the social and historical conditions then prevailing, it was not yet able to form a theoretical system, hence it could not fully explain the world and was supplanted by metaphysics. The famous German philosopher Hegel, who lived in the late 18th and early 19th centuries, made most important contributions to dialectics, but his dialectics was idealist. It was not until Marx and Engels, the great protagonists of the proletarian movement, had synthesized the positive achievements in the history of human knowledge and, in particular, critically absorbed the rational elements of Hegelian dialectics and created the great theory of dialectical and historical materialism that an unprecedented revolution occurred in the history of human knowledge. This theory was further developed by Lenin and Stalin. As soon as it spread to China, it wrought tremendous changes in the world of Chinese thought.

This dialectical world outlook teaches us primarily how to observe and analyse the movement of opposites in different things and, on the basis of such analysis, to indicate the methods for resolving contradictions. It is therefore most important for us to understand the law of contradiction in things in a concrete way.

For convenience of exposition, I shall deal first with the universality of contradiction and then proceed to the particularity of contradiction. The reason is that the universality of contradiction can be explained more briefly, for it has been widely recognized ever since the materialist-dialectical world outlook was discovered and materialist dialectics applied with outstanding success to analysing many aspects of human history and natural history and to changing many aspects of society and nature (as in the Soviet Union) by the great creators and continuers of Marxism--Marx, Engels, Lenin and Stalin; whereas the particularity of contradiction is still not dearly understood by many comrades, and especially by the dogmatists. They do not understand that it is precisely in the particularity of contradiction that the universality of contradiction resides. Nor do they understand how important is the study of the particularity of contradiction in the concrete things confronting us for guiding the course of revolutionary practice. Therefore, it is necessary to stress the study of the particularity of contradiction and to explain it at adequate length. For this reason, in our analysis of the law of contradiction in things, we shall first analyse the universality of contradiction, then place special stress on analysing the particularity of contradiction, and finally return to the universality of contradiction.

The universality or absoluteness of contradiction has a twofold meaning. One is that contradiction exists in the process of development of all things, and the other is that in the process of development of each thing a movement of opposites exists from beginning to end.

Contradiction is the basis of the simple forms of motion (for instance, mechanical motion) and still more so of the complex forms of motion.

…. …. ….

Lenin illustrated the universality of contradiction as follows:

In mathematics: + and--. Differential and integral.

In mechanics: action and reaction.

In physics: positive and negative electricity.

In chemistry: the combination and dissociation of atoms.

In war, offence and defence, advance and retreat, victory and defeat are all mutually contradictory phenomena. One cannot exist without the other. The two aspects are at once in conflict and in interdependence, and this constitutes the totality of a war, pushes its development forward and solves its problems.

Every difference in men's concepts should be regarded as reflecting an objective contradiction. Objective contradictions are reflected in subjective thinking, and this process constitutes the contradictory movement of concepts, pushes forward the development of thought, and ceaselessly solves problems in man's thinking.

Opposition and struggle between ideas of different kinds constantly occur within the Party; this is a reflection within the Party of contradictions between classes and between the new and the old in society. If there were no contradictions in the Party and no ideological struggles to resolve them, the Party's life would come to an end.

Thus it is already clear that contradiction exists universally and in all processes, whether in the simple or in the complex forms of motion, whether in objective phenomena or ideological phenomena. But does contradiction also exist at the initial stage of each process?

….Even under the social conditions existing in the Soviet Union, there is a difference between workers and peasants and this very difference is a contradiction, although, unlike the contradiction between labour and capital, it will not become intensified into antagonism or assume the form of class struggle; the workers and the peasants have established a firm alliance in the course of socialist construction and are gradually resolving this contradiction in the course of the advance from socialism to communism. The question is one of different kinds of contradiction, not of the presence or absence of contradiction. Contradiction is universal and absolute, it is present in the process of development of all things and permeates every process from beginning to end.

What is meant by the emergence of a new process? The old unity with its constituent opposites yields to a new unity with its constituent opposites, whereupon a new process emerges to replace the old. The old process ends and the new one begins. The new process contains new contradictions and begins its own history of the development of contradictions.

. . . .Chinese Communists must learn this method; only then will they be able correctly to analyse the history and the present state of the Chinese revolution and infer its future.

There are still two points in the problem of the particularity of contradiction which must be singled out for analysis, namely, the principal contradiction and the principal aspect of a contradiction.

There are many contradictions in the process of development of a complex thing, and one of them is necessarily the principal contradiction whose existence and development determine or influence the existence and development of the other contradictions.

For instance, in capitalist society the two forces in contradiction, the proletariat and the bourgeoisie, form the principal contradiction. The other contradictions, such as those between the remnant feudal class and the bourgeoisie, between the peasant petty bourgeoisie ant the bourgeoisie, between the proletariat and the peasant petty bourgeoisie, between the non-monopoly capitalists and the monopoly capitalists, between bourgeois democracy and bourgeois fascism, among the capitalist countries and between imperialism and the colonies, are all determined or influenced by this principal contradiction.

In a semi-colonial country such as China, the relationship between the principal contradiction and the non-principal contradictions presents a complicated picture.

When imperialism launches a war of aggression against such a country, all its various classes, except for some traitors, can temporarily unite in a national war against imperialism. At such a time, the contradiction between imperialism and the country concerned becomes the principal contradiction, while all the contradictions among the various classes within the country (including what was the principal contradiction, between the feudal system and the great masses of the people) are temporarily relegated to a secondary and subordinate position. So it was in China in the Opium War of 1840, the Sino-Japanese War of 1894 and the Yi Ho Tuan War of 1900, and so it is now in the present Sino-Japanese War.

But in another situation, the contradictions change position. When imperialism carries on its oppression not by war, but by milder means--political, economic and cultural--the ruling classes in semi-colonial countries capitulate to imperialism, and the two form an alliance for the joint oppression of themasses of the people. At such a time, the masses often resort to civil war against the alliance of imperialism and the feudal classes, while imperialism often employs indirect methods rather than direct action in helping the reactionaries in the semi-colonial countries to oppress the people, and thus the internal contradictions become particularly sharp. This is what happened in China in the Revolutionary War of 1911, the Revolutionary War of 1924-27, and the ten years of Agrarian Revolutionary War after 1997. Wars among the various reactionary ruling groups in the semi-colonial countries, e.g., the wars among the warlords in China, fall into the same category.

When a revolutionary civil war develops to the point of threatening the very existence of imperialism and its running dogs, the domestic reactionaries, imperialism often adopts other methods in order to maintain its rule; it either tries to split the revolutionary front from within or sends armed forces to help the domestic reactionaries directly. At such a time, foreign imperialism and domestic reaction stand quite openly at one pole while the masses of the people stand at the other pole, thus forming the principal contradiction which determines or influences the development of the other contradictions. The assistance given by various capitalist countries to the Russian reactionaries after the October Revolution is an example of armed intervention. Chiang Kai-shek's betrayal in 1927 is an example of splitting the revolutionary front.

But whatever happens, there is no doubt at all that at every stage in the development of a process, there is only one principal contradiction which plays the leading role.

Hence, if in any process there are a number of contradictions, one of them must be the principal contradiction playing the leading and decisive role, while the rest occupy a secondary and subordinate position. Therefore, in studying any complex process in which there are two or more contradictions, we must devote every effort to funding its principal contradiction. Once this principal contradiction is grasped, all problems can be readily solved. This is the method Marx taught us in his study of capitalist society. Likewise Lenin and Stalin taught us this method when they studied imperialism and the general crisis of capitalism and when they studied the Soviet economy. There are thousands of scholars and men of action who do not understand it, and the result is that, lost in a fog, they are unable to get to the heart of a problem and naturally cannot find a way to resolve its contradictions.

……….

In studying the particularity of contradiction, unless we examine these two facets--the principal and the non-principal contradictions in a process, and the principal and the non-principal aspects of a contradiction--that is, unless we examine the distinctive character of these two facets of contradiction, we shall get bogged down in abstractions, be unable to understand contradiction concretely and consequently be unable to find the correct method of resolving it. The distinctive character or particularity of these two facets of contradiction represents the unevenness of the forces that are in contradiction. Nothing in this world develops absolutely evenly; we must oppose the theory of even development or the theory of equilibrium. Moreover, it is these concrete features of a contradiction and the changes in the principal and non-principal aspects of a contradiction in the course of its development that manifest the force of the new superseding the old. The study of the various states of unevenness in contradictions, of the principal andnon-principal contradictions and of the principal and the non-principal aspects of a contradiction constitutes an essential method by which a revolutionary political party correctly determines its strategic and tactical policies both in political and in military affairs. All Communists must give it attention.

The question of the struggle of opposites includes the question of what is antagonism. Our answer is that antagonism is one form, but not the only form, of the struggle of opposites.

In human history, antagonism between classes exists as a particular manifestation of the struggle of opposites. Consider the contradiction between the exploiting and the exploited classes. Such contradictory classes coexist for a long time in the same society, be it slave society, feudal society or capitalistsociety, and they struggle with each other; but it is not until the contradiction between the two classes develops to a certain stage that it assumes the formof open antagonism and develops into revolution. The same holds for the transformation of peace into war in class society.

Before it explodes, a bomb is a single entity in which opposites coexist in given conditions. The explosion takes place only when a new condition, ignition, is present. An analogous situation arises in all those natural phenomena which finally assume the form of open conflict to resolve old contradictions and produce new things.

It is highly important to grasp this fact. It enables us to understand that revolutions and revolutionary wars are inevitable in class society and that without them, it is impossible to accomplish any leap in social development and to overthrow the reactionary ruling classes and therefore impossible for the people to win political power. Communists must expose the deceitful propaganda of the reactionaries, such as the assertion that social revolution is unnecessary and impossible. They must firmly uphold the Marxist-Leninist theory of social revolution and enable the people to understand that social revolution is not only entirely necessary but also entirely practicable, and that the whole history of mankind and the triumph of the Soviet Union have confirmed this scientific truth.

However, we must make a concrete study of the circumstances of each specific struggle of opposites and should not arbitrarily apply the formula discussed above to everything. Contradiction and struggle are universal and absolute, but the methods of resolving contradictions, that is, the forms of struggle, differ according to the differences in the nature of the contradictions. Some contradictions are characterized by open antagonism, others are not. In accordance with the concrete development of things, some contradictions which were originally non-antagonistic develop into antagonistic ones, while others which were originally antagonistic develop into non-antagonistic ones.

As already mentioned, so long as classes exist, contradictions between correct and incorrect ideas in the Communist Party are reflections within the Party of class contradictions. At first, with regard to certain issues, such contradictions may not manifest themselves as antagonistic. But with the development of the class struggle, they may grow and become antagonistic. The history of the Communist Party of the Soviet Union shows us that the contradictions between the correct thinking of Lenin and Stalin and the fallacious thinking of Trotsky, Bukharin and others did not at first manifest themselves in an antagonistic form, but that later they did develop into antagonism. There are similar cases in the history of the Chinese Communist Party. At first the contradictions between the correct thinking of many of our Party comrades and the fallacious thinking of Chen Tu-hsiu, Chang Kuo-tao and others also did not manifest themselves in an antagonistic form, but later they did develop into antagonism. At present the contradiction between correct and incorrect thinking in our Party does not manifest itself in an antagonistic form, and if comrades who have committed mistakes can correct them, it will not develop into antagonism. Therefore, the Party must on the one hand wage a serious struggle against erroneous thinking, and on the other give the comrades who have committed errors ample opportunity to wake up. This being the case, excessive struggle is obviously inappropriate. But if the people who have committed errors persist in them and aggravate them, there is the possibility that this contradiction will develop into antagonism.

Economically, the contradiction between town and country is an extremely antagonistic one both in capitalist society, where under the rule of the bourgeoisie the towns ruthlessly plunder the countryside, and in the Kuomintang areas in China, where under the rule of foreign imperialism and the Chinese big comprador bourgeoisie the towns most rapaciously plunder the countryside. But in a socialist country and in our revolutionary base areas, this antagonistic contradiction has changed into one that is non-antagonistic; and when communist society is reached it will be abolished.