Some have said that the thesis [of indeterminacy] is a consequence of my behaviorism. Some have said that it is a reductio ad absurdum of my behaviorism. I disagree with this second point, but I agree with the first. I hold further that the behaviorism approach is mandatory. In psychology one may or may not be a behaviorist, but in linguistics one has no choice.

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

The lore of our fathers is a fabric of sentences. In our hands it develops and changes, through more or less arbitrary and deliberate revisions and additions of our own, more or less directly occasioned by the continuing stimulation of our sense organs. It is a pale gray lore, black with fact and white with convention. But I have found no substantial reasons for concluding that there are any quite black threads in it, or any white ones.

The scientist is indistinguishable from the common man in his sense of evidence, except that the scientist is more careful.

Confusion of sign and object is original sin coeval with the word.

Irrefragability, thy name is mathematics.

Unscientific man is beset by a deplorable desire to have been right. The scientist is distinguished by a desire to be right.