Many things difficult to design prove easy to performance.

Many things difficult to design prove easy to performance.

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.

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.

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

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

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.

Let us work without theorizing, 'Tis the only way to make life endurable.

Let us work without theorizing, 'Tis the only way to make life endurable.

It is the theory that decides what can be observed

It is the theory that decides what can be observed

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.