Nature in denying us perennial youth has at least invited us to become unselfish and noble.

People are usually more firmly convinced that their opinions are precious than that they are true.

The great difficulty in education is to get experience out of ideas.

By "essence" I understand a universal, of any degree of complexity and definition, which may be given immediately, whether to sense or to thought.... This object of pure sense or pure thought, with no belief superadded, an object inwardly complete and individual, but without external relations or physical status, is what I call an essence.

The fly that prefers sweetness to a long life may drown in honey.

Philosophers are very severe towards other philosophers because they expect too much.

A country without a memory is a country of madmen.