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.

按照唯物辩证法的观点，自然界的变化，主要地是由于自然界内部矛盾的发展。社会的变化，主要地是由于社会内部矛盾的发展，即生产力和生产关系的矛盾，阶级之间的矛盾，新旧之间的矛盾，由于这些矛盾的发展，推动了社会的前进，推动了新旧社会的代谢。唯物辩证法是否排除外部的原因呢？并不排除。唯物辩证法认为外因是变化的条件，内因是变化的根据，外因通过内因而起作用。鸡蛋因得适当的温度而变化为鸡子，但温度不能使石头变为鸡子，因为二者的根据是不同的。各国人民之间的互相影响是时常存在的。在资本主义时代，特别是在帝国主义和无产阶级革命的时代，各国在政治上、经济上和文化上的互相影响和互相激动，是极其巨大的。十月社会主义革命不只是开创了俄国历史的新纪元，而且开创了世界历史的新纪元，影响到世界各国内部的变化，同样地而且还特别深刻地影响到中国内部的变化，但是这种变化是通过了各国内部和中国内部自己的规律性而起的。两军相争，一胜一败，所以胜败，皆决于内因。

In any revolution, its internal causes are fundamental and its external ones are supplementary.

A “right of nations” which is valid for all countries and all times is nothing more than a metaphysical cliché of the type of ”rights of man” and “rights of the citizen.” Dialectic materialism, which is the basis of scientific socialism, has broken once and for all with this type of “eternal” formula. For the historical dialectic has shown that there are no “eternal” truths and that there are no “rights.” ... In the words of Engels, “What is good in the here and now, is an evil somewhere else, and vice versa” – or, what is right and reasonable under some circumstances becomes nonsense and absurdity under others. Historical materialism has taught us that the real content of these “eternal” truths, rights, and formulae is determined only by the material social conditions of the environment in a given historical epoch.

The Communist dream of a great new "one world" of the future is based on the belief that a regime of violence and coercion under the Dictatorship of the Proletariat would permit the establishment of a society which would produce a new order of men who would acquire the habit of observing what Lenin called the "simple fundamental rules of every-day social life in common." The fallacy of this hope lies in Communism's perverted interpretation of human behavior. It assumes, on the basis of Dialectical Materialism, that if you change things outside of a man this automatically compels a change on the inside of the man. The inter-relation between environment on the outside and the internal make-up of man is not to be disputed, but environment only conditions man, it does not change his very nature. For example, just as men will always laugh, eat, propagate, gravitate into groups and explore the unknown, so likewise they will always enjoy the pleasure of possessing things (which alone gives pleasure to sharing); they will always possess the desire for individual expression or self-determination, the ambition to improve their circumstances and the motive to excel above others. These qualities are inherent in each generation and cannot be legislated away nor ignored.

The Marxist philosophy of dialectical materialism has two outstanding characteristics. One is its class nature: it openly avows that dialectical materialism is in the service of the proletariat. The other is its practicality: it emphasizes the dependence of theory on practice, emphasizes that theory is based on practice and in turn serves practice. The truth of any knowledge or theory is determined not by subjective feelings, but by objective results in social practice. Only social practice can be the criterion of truth. The standpoint of practice is the primary and basic standpoint in the dialectical materialist theory of knowledge.

Dialectical materialism works like cocaine, let's say. If you sniff it once or twice, it may not change your life. If you use it day after day, though, it will make you into an addict, a different man.

Lysenkoism is held up by bourgeois commentators as the supreme demonstration that conscious ideology cannot inform scientific practice and that "ideology has no place in science." On the other hand, some writers are even now maintaining a Lysenkoist position because they believe that the principles of dialectical materialism contradict the claims of genetics. Both of these claims stem from a vulgarisation of Marxist philosophy through deliberate hostility, in the first case, or ignorance, in the second. Nothing in Marx, Lenin or Mao contradicts the particular physical facts and processes of a particular set of natural phenomena in the objective world, because what they wrote about nature was at a high level of abstraction. The error of the Lysenkoist claim arises from attempting to apply a dialectical analysis of physical problems from the wrong end. Dialectical materialism is not, and has never been, a programmatic method for solving particular physical problems. Rather, dialectical analysis provides an overview and a set of warning signs against particular forms of dogmatism and narrowness of thought. It tells us, "Remember that history may leave an important trace. Remember that being and becoming are dual aspects of nature. Remember that conditions change and that the conditions necessary to the initiation of some process may be destroyed by the process itself. Remember to pay attention to real objects in space and time and not lose them utterly in idealized abstractions. Remember that qualitative effects of context and interaction may be lost when phenomena are isolated." And above all else, "Remember that all the other caveats are only reminders and warning signs whose application to different circumstances of the real world is contingent."

When a task, no matter which, has to be performed, but there is as yet no guiding line, method, plan or policy, the principal and decisive thing is to decide on a guiding line, method, plan or policy. When the superstructure (politics, culture, etc.) obstructs the development of the economic base, political and cultural changes become principal and decisive. Are we going against materialism when we say this? No. The reason is that while we recognize that in the general development of history the material determines the mental and social being determines social consciousness, we also--and indeed must--recognize the reaction of mental on material things, of social consciousness on social being and of the superstructure on the economic base. This does not go against materialism; on the contrary, it avoids mechanical materialism and firmly upholds dialectical materialism.

The world is driven by contradictory movements to produce developments and changes which in turn drive struggle and innovation. Marxism and Chinese traditional culture have a high degree of internal consistency on this point, which precisely constitutes the deep philosophical roots of the Sinification of Marxism.

和形而上学的宇宙观相反，唯物辩证法的宇宙观主张从事物的内部、从一事物对他事物的关系去研究事物的发展，即把事物的发展看做是事物内部的必然的自己的运动，而每一事物的运动都和它的周围其它事物互相联系着和互相影响着。事物发展的根本原因，不是在事物的外部而是在事物的内部，在于事物内部的矛盾性。任何事物内部都有这种矛盾性，因此引起了事物的运动和发展。事物内部的这种矛盾性是事物发展的根本原因，一事物和他事物的互相联系和互相影响则是事物发展的第二位的原因。这样，唯物辩证法就有力地反对了形而上学的机械唯物论和庸俗进化论的外因论或被动论。这是清楚的，单纯的外部原因只能引起事物的机械的运动，即范围的大小，数量的增减，不能说明事物何以有性质上的千差万别及其互相变化。

I therefore affirm that, to understand our society, our dialectical method is necessary, while that of the West, non-dialectical, is of no use. But be careful: I am not talking about “dialectics” in the sense given to it by Soviet philosophies – starting with Stalin in his Dialectical and Historical Materialism; I am talking about this ability to take into account all the complexity and changing nature of formations such as our gigantic society. Ah! I'm itching to describe this method! But by giving it the efficiency, the practical sense of the Western style of thinking. Is it possible ? Who knows, perhaps the most suitable forms are born from these unthinkable compromise. p. 353

We have an external and an internal crisis situation facing us in our community. The external crisis is racism and colonialism, which works to systematically oppress us and is responsible for whatever internal crisis there is. The internal crisis is the result of an environment where drugs and violence (both social and physical) are rampant, and life is sometimes considered cheap. Black-on-Black crimes and internal violence are destroying our community. It is undoubtedly self-hatred and the desperate economic and social conditions we live under which makes us prey on each other. Drugs, frustrated rage, prostitution and other vices are symptoms of oppression.

Materialism and Spirituality: There are today three major human trends: First of all, a trend towards a spiritual and free way of life; secondly, a trend towards intellectual unfoldment; and lastly, a potent trend towards material living and aggression. At present, the last of these innate tendencies is in the saddle, with the second, the intellectual attitude, throwing its weight upon the side of the material goals. A relatively small group is throwing the weight of human aspiration upon the side of the spiritual values. The war between the pairs of opposites — materialism and spirituality — is raging fiercely. Only as men turn away from material aggression and towards spiritual objectives will the world situation change, and men — motivated by goodwill — force the aggressors back to their own place and release humanity from fear and force. We are today reaping the results of our own sowing. The recognition of the cause of the problem provides humanity with the opportunity to end it. The time has arrived in which it is possible to institute those changes in attitude which will bring an era of peace and goodwill, founded on right human relations.
These two forces — materialism and spirituality — face each other. What will be the outcome? Will men arrest the evil and initiate a period of understanding, cooperation and right relationship, or will they continue the process of selfish planning and of economic and militant competition? This question must be answered by the clear thinking of the masses and by the calm and unafraid challenges of the democracies. (Section Two, The General World Picture, part 5, p. 183