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.

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.

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

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

You have to know you can first. How comes later.

You have to know you can first. How comes later.

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

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

An ounce of action is worth a ton of theory.

An ounce of action is worth a ton of theory.

A theory has only the alternative of being right or wrong. A model has a third possibility - it may read more

A theory has only the alternative of being right or wrong. A model has a third possibility - it may be right but irrelevant.

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

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

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.