Cats were created to eat mice ",which is a famous saying of Engels satirizing theological teleology. Theological teleology was first put forward by the ancient Greek philosopher Socrates. He believes that everything in the world is decided for a certain purpose, "putting everything special in the best position". The most famous representatives of this theory in modern times are German idealist philosophers Leibniz and Wolff. They believe that the smallest unit of a thing is a "list", and the "life and death" of a "list" is determined by the will of God. Various "lists" make up different things. The harmonious development of all "monads" forms a good order of the universe. This is arranged by God on the basis of "sufficient reasons" and "meeting the purpose". Since this world is chosen by God among countless possible worlds, then this world is the most ideal society and everything is the best. Even evil is the best. The existence of evil can set off good and make good better. Therefore, everything exists for a purpose.

Engels satirized their idealistic preaching bitterly: "cats were created to eat mice, mice were created to eat cats, and the whole nature was created to prove the wisdom of the creator." In fact, in the whole objective world, the appearance of any kind of thing or phenomenon is caused by another or more phenomena that are internally related to it; The appearance of this thing or phenomenon will inevitably lead to changes in other things or phenomena that are intrinsically related to it. This is the connection between cause and effect. This connection is universal in the objective world, and it plays a vital role in the development of objective things. Generally speaking, our work has no result, but in fact, our work has not achieved the expected purpose, which is the result itself; Just because we haven't found the reasons for some phenomena doesn't mean that these phenomena have no reasons. This causal relationship is neither determined by anyone's subjective will, nor controlled by any supernatural mysterious force, let alone the will of God. This is an objective existence that is independent of anyone's subjective will. Although we can create conditions for the development of things to benefit the results of our work, we can't go beyond the objective reality and artificially create various reasons and results.

In nature, cats are natural enemies of mice and wolves are natural enemies of sheep. But these species can exist and develop because there are conditions in nature that enable them to survive; These species cannot reproduce indefinitely, because there are many factors controlling their survival in the objective world. Natural conditions are constantly changing, and various species are constantly adapting to this change, thus causing the evolution of organisms; Species that are not adapted to the changing environment are on the verge of extinction. All this is the result of natural selection and survival competition. It is obviously unreasonable to think that an omnipotent God created a species and made it extinct. Therefore, the causal relationship in objective things cannot be attributed to the fact that there is no God at all.

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