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.

Relativity applies to physics, not ethics

Relativity applies to physics, not ethics

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.

How empty is theory in the presence of fact

How empty is theory in the presence of fact

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

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

The theory seems to be that as long as a man is a failure he is one of God's children, read more

The theory seems to be that as long as a man is a failure he is one of God's children, but that as soon as he succeeds he is taken over by the Devil.

An ounce of action is worth a ton of theory.

An ounce of action is worth a ton of theory.

It is the theory that decides what can be observed

It is the theory that decides what can be observed

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.