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.

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.

Many things difficult to design prove easy to performance.

Many things difficult to design prove easy to performance.

It is the theory that decides what can be observed

It is the theory that decides what can be observed

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.

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.

[Do not] put too much confidence in experimental results until they have been confirmed by theory.

[Do not] put too much confidence in experimental results until they have been confirmed by theory.

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

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

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

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