Physics investigates the essential nature of the world, and biology describes a local bump. Psychology, human psychology, describes a bump on the bump.

The three main medieval points of view regarding universals are designated by historians as realism, conceptualism, and nominalism. Essentially these same three doctrines reappear in twentieth-century surveys of the philosophy of mathematics under the new names logicism, intuitionism, and formalism.

No two of us learn our language alike, nor, in a sense, does any finish learning it while he lives.

Logic is an old subject, and since 1879 it has been a great one.

One man's observation is another man's closed book or flight of fancy.

Uncritical semantics is the myth of a museum in which the exhibits are meanings and the words are labels. To switch languages is to change the labels.

We do not learn first what to talk about and then what to say about it.