Robert A. Heinlein - Time Enough For Love

Beware of the "Black Swan" fallacy. Deductive logic is tautological; there is no way to get a new truth out of it, and it manipulates false statements as readily as true ones. If you fail to remember this, it can trip you—with perfect logic. The designers of the earliest computers called this the "GIGO Law," i.e., "Garbage in, garbage out." Inductive logic is much more difficult—but can produce new truths.

A dozen Heinlein quotations for sci fi day

Robert A. Heinlein - Gulf

If the average man thinks at all, he does silly things like generalizing from a single datum. He uses one-valued logics. If he is exceptionally bright, he may use two-valued, 'either-or' logic to arrive at his wrong answers. If he is hungry, hurt, or personally interested in the answer, he can't use any sort of logic and will discard an observed fact as blithely as he will stake his life on a piece of wishful thinking. He uses the technical miracles created by superior men without wonder nor surprise, as a kitten accepts a bowl of milk. Far from aspiring to higher reasoning, he is not even aware that higher reasoning exists. He classes his own mental proccess as being of the same sort as the genius of an Einstein. Man is not a rational animal; he is a rationalizing animal.

A dozen Heinlein quotations for sci fi day