The epistemology of dialectical materialism emphasizes two characteristic features of the picture of the world existing in our minds. First, it presents itself as reflection, i.e., as an image of an objective reality that exists independent of our consciousness. Secondly, this picture provides a reflection of the real world and the regularities of its development that is only approximately complete. The following comment by Lenin is of fundamental significance in this connection: "Cognition is man's reflection of nature, but it is not a simple, not a direct, not a complete reflection, but a process involving a series of abstractions, the shaping and formation of concepts, laws, and the like, various concepts, laws, etc. and embraces, conditionally and approximately, the universal regularity of nature which is eternally moving and developing".