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.

A purpose, an intention, a design, strikes everywhere the careless, the most stupid thinker

A purpose, an intention, a design, strikes everywhere the careless, the most stupid thinker

A designer knows he has achieved perfection not when there is nothing left to add, but when there is nothing read more

A designer knows he has achieved perfection not when there is nothing left to add, but when there is nothing left to take away.rn

Conjecture as to things useful, is good; but conjecture as to what it would be useless to know, is very read more

Conjecture as to things useful, is good; but conjecture as to what it would be useless to know, is very idle.

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.

Relativity applies to physics, not ethics

Relativity applies to physics, not ethics

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.

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.

How empty is theory in the presence of fact

How empty is theory in the presence of fact