Theory Sayings and Quotes

Below you will find our collection of inspirational, wise, and humorous old theory quotes, theory sayings, and theory proverbs, collected over the years from a variety of sources.

Whenever a theory appears to you as the only possible one, take this as a sign that you have neither understood the theory nor the problem which it was intended to solve. Karl Popper
No theory changes what it is a theory about; man remains what he has always been. B. F. Skinner
All theory is against the freedom of the will; all experience for it. Samuel Johnson
A professor must have a theory as a dog must have fleas. H. L. Mencken
That theory is worthless. It isn't even wrong! Wolfgang Pauli
A theory which cannot be mortally endangered cannot be alive. W. A. H. Rushton
Thought and theory must precede all salutary action; yet action is nobler in itself than either thought or theory. William Wordsworth