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.

It is the theory that decides what can be observed

It is the theory that decides what can be observed

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

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

Many things difficult to design prove easy to performance.

Many things difficult to design prove easy to performance.

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

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

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.