Books are infinite in number and time is short. The secret of knowledge is to take what is essential. Take that and try to live up to it.

Where the mind is without fear and the head is held high Where knowledge is free.

Knowledge of what is does not open the door directly to what should be.

Imagination is more important than knowledge.

Information is not knowledge.

Life consists in penetrating the unknown, and fashioning our actions in accord with the new knowledge thus acquired.