In theory there is no difference between theory and practice. In practice there is.

In theory there is no difference between theory and practice. In practice there is.

[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.

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.

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

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

Relativity applies to physics, not ethics

Relativity applies to physics, not ethics

How empty is theory in the presence of fact

How empty is theory in the presence of fact

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.