Good Quote by Ludwig Boltzmann

There is nothing more practical than a good theory.

— Leonid Brezhnev

There is nothing so practical as a good theory.

— Kurt Lewin

Any theory is better than no theory.

— Fuller Albright

No theory is good unless it permits, not rest, but the greatest work. No theory is good except on condition that one use it…

— Andre Gide

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

— Jean-Martin Charcot

The theory of our modern technic shows that nothing is as practical as theory.

— J. Robert Oppenheimer

Some theories are good for nothing except to be argued about.

— Georg C. Lichtenberg

Theory looks well on paper, but does not amount to anything without practice.

— Josh Billings

Never underlook the words of someone giving you advice from experience, cuz there is clear difference between theory and practical.

— Blaze Olamiday

Today's practicality is often no more than the accepted form of yesterday's theory.

— Anonymous

Theory is splendid but until put into practice, it is valueless.

— James Cash Penney

Theory, from whatever source, is not perfect until it is reduced to practice.

— Hosea Ballou