An ounce of action is worth a ton of theory.

An ounce of action is worth a ton of theory.

A theory is no more like a fact than a photograph is like a person.

A theory is no more like a fact than a photograph is like a person.

Relativity applies to physics, not ethics

Relativity applies to physics, not ethics

You cannot run a business, or anything else, on a theory.

You cannot run a business, or anything else, on a theory.

Life is so unlike theory.

Life is so unlike theory.

Let us work without theorizing, 'Tis the only way to make life endurable.

Let us work without theorizing, 'Tis the only way to make life endurable.

I never once made a discovery ... I speak without exaggeration that I have constructed three thousand different theories in read more

I never once made a discovery ... I speak without exaggeration that I have constructed three thousand different theories in connection with the electric light ... Yet in only two cases did my experiments prove the truth of my theory.

How empty is theory in the presence of fact

How empty is theory in the presence of fact

In theory there is no difference between theory and practice. In practice there is.

In theory there is no difference between theory and practice. In practice there is.