In general, then, the truth or falsity of a statement is relative, not only to the individual accepting or rejecting the statement, but also to the circumstances in which that person finds himself. Humans are in contact with nature at a fundamental level. The human understanding of nature is a consequence of the fact that nature confronts humans when they try to fulfill their needs. This is the case with any organism, and each species reacts according to the tools of that species. One of the human tools is the intellect, and it works through the cognition of the perception of elements of nature.
Cognition occurs as the organizing of sensory data into categories.
Without the ability to make generalizations, man would not be able to think. Moreover, the human capacity to think is exactly the same as making abstractions about experience. There is nothing more to descriptions of the world than those abstractions. Details about the world are described only in terms of generalizations, for if there were a word for a specific detail unique to only one event, then that word would be nothing but a name -an abbreviation for the term, the specific detail x , unique to only this one event, y . A world which is independent of what humans might think, which is what the logical positivists seek to know, is useless to humans, and impossible for a human to comprehend.