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.

It is the theory that decides what can be observed

It is the theory that decides what can be observed

A young boy is a theory, an old man is a fact.

A young boy is a theory, an old man is a fact.

If the facts don't fit the theory, change the facts.

If the facts don't fit the theory, change the facts.

How empty is theory in the presence of fact

How empty is theory in the presence of fact

Many things difficult to design prove easy to performance.

Many things difficult to design prove easy to performance.

In scientific work, those who refuse to go beyond fact rarely get as far as fact.

In scientific work, those who refuse to go beyond fact rarely get as far as fact.

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

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

An ounce of action is worth a ton of theory.

An ounce of action is worth a ton of theory.