Education is the acquisition of the art of the utilisation of knowledge.

Systems, scientific or philosophic, come and go. Each method of limited understanding is at length exhausted. In its prime each system is a triumphant success: in its decay it is an obstructive nuisance.

It is more important that a proposition be interesting than that it be true.

The only use of a knowledge of the past is to equip us for the present. The present contains all that there is. It is holy ground; for it is the past, and it is the future.

There is no more common error than to assume that, because prolonged and accurate mathematical calculations have been made, the application of the result to some fact of nature is absolutely certain.

Almost all new ideas have a certain aspect of foolishness when they are first produced.

We must produce a great age, or see the collapse of the upward striving of our race.