Dogmatism is the anti-Christ of learning.

You cannot be wise without some basis of knowledge, but you may easily acquire knowledge and remain bare of wisdom.

Wisdom alone is true ambition's aim, wisdom is the source of virtue and of fame; obtained with labour, for mankind employed, and then, when most you share it, best enjoyed.

Everything of importance has been said before by somebody who did not discover it.

Philosophy begins in wonder. And, at the end, when philosophic thought has done its best, the wonder remains.

As society is now constituted, a literal adherence to the moral precepts scattered throughout the Gospels would mean sudden death.

The science of pure mathematics, in its modern developments, may claim to be the most original creation of the human spirit.