How the past perishes is how the future becomes.

The whole of mathematics consists in the organization of a series of aids to the imagination in the process of reasoning.

Error is the price we pay for progress.

Each generation criticizes the unconscious assumptions made by its parent. It may assent to them, but it brings them out in the open.

The result of teaching small parts of a large number of subjects is the passive reception of disconnected ideas, not illumed with any spark of vitality.

The many become one and are increased by one.

The defense of morals is the battle-cry which best rallies stupidity against change.