The map is not the territory.

It is now no mystery that some quite influential 'philosophers' were 'mentally' ill.

The map is not the territory... The only usefulness of a map depends on similarity of structure between the empirical world and the map.

Mathematics and logic have been proved to be one; a fact from which it seems to follow that mathematics may successfully deal with non-quantitative problems in a much broader sense than was suspected to be possible.

A person does what he does because he sees the world as he sees it.

Man's achievements rest upon the use of symbols.... we must consider ourselves as a symbolic, semantic class of life, and those who rule the symbols, rule us.

He who learns and learns and yet does not know what he knows, is one who plows and plows yet never sows.