An ounce of action is worth a ton of theory.

An ounce of action is worth a ton of theory.

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

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

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.

Science is organized common sense where many a beautiful theory was killed by an ugly fact.

Science is organized common sense where many a beautiful theory was killed by an ugly fact.

He who loves practice without theory is like the sailor who boards ship without a rudder and compass and never read more

He who loves practice without theory is like the sailor who boards ship without a rudder and compass and never knows where he may cast.

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

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

It is the theory that decides what can be observed

It is the theory that decides what can be observed

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.