Able Quote by Brian Schmidt

I'm not sure what theory is, unless it's the pursuit of fundamental questions.

— David Antin

Theory is needed to tell you where to look.

— Marcus du Sautoy

It is a test of true theories not only to account for but to predict phenomena.

— William Whewell

Everybody has a theory.

— Daniel Handler

Whenever a true theory appears, it will be its own evidence. Its test is, that it will explain all phenomena.

— Ralph Waldo Emerson

Theory is knowledge that doesn't work. Practice is when everything works and you don't know why.

— Hermann Hesse

Theory is good; but it doesn't prevent things from existing.

— Jean-Martin Charcot

The test of a theory is its ability to cope with all the relevant phenomena, not its a priori 'reasonableness'. The latter would have…

— John Polkinghorne

Different areas present us with possibilities to test different theories.

— Torbjorn Tannsjo

There never comes a point where a theory can be said to be true. The most that one can claim for any theory is…

— A.J. Ayer

Any theory is better than no theory.

— Fuller Albright

“Someone who thinks up a new theory is the last person who should be trusted with the job of testing it. A new theory…

— Judith Rich Harris