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

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

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.

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.

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.

Integrity is telling myself the truth. And honesty is telling the truth to other people.

Integrity is telling myself the truth. And honesty is telling the truth to other people.

An ounce of action is worth a ton of theory.

An ounce of action is worth a ton of theory.

A man is ethical only when life, as such, is sacred to him, that of plants and animals as that read more

A man is ethical only when life, as such, is sacred to him, that of plants and animals as that of his fellow men, and when he devotes himself helpfully to all life that is in need of help. -Albert Schweitzer.

Our theories of the eternal are as valuable as are those which a chick which has not broken its way read more

Our theories of the eternal are as valuable as are those which a chick which has not broken its way through its shell might form of the outside world.