Natural thinking in science and everyday life is untroubled by the difficulties concerning the possibility of cognition. Philosophical thinking is circumscribed by one's position toward the problems concerning the possibility of cognition. The perplexities in which reflection about the possibility of a cognition that "gets at" the things themselves becomes entangled: How can we be sure that cognition accords with things as they exist in themselves, that it "gets at them"? What do things in themselves care about our ways of thinking and the logical rules governing them? These are laws of how we think; they are psychological laws — Biologism, psychological laws as laws of adaptation.