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.

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

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

There can be no theory of any account unless it corroborate with the theory of the earth.

There can be no theory of any account unless it corroborate with the theory of the earth.

An ounce of action is worth a ton of theory.

An ounce of action is worth a ton of theory.

Many things difficult to design prove easy to performance.

Many things difficult to design prove easy to performance.

Relativity applies to physics, not ethics

Relativity applies to physics, not ethics

It is the theory that decides what can be observed

It is the theory that decides what can be observed

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.

Science is organized common sense where many a beautiful theory was killed by an ugly fact.

Science is organized common sense where many a beautiful theory was killed by an ugly fact.