To marry unequally is to suffer equally.

A belief is not true simply because it is useful.

Man never knows what he wants; he aspires to penetrate mysteries and as soon as he has, wants to re-establish them. Ignorance irritates him and knowledge cloys.

To do easily what is difficult for others is the mark of talent.

The test of every religious, political, or educational system, is the man which it forms. If a system injures the intelligence it is bad. If it injures the character it is vicious. If it injures the conscience it is criminal.

Self-interest is an inexhaustible source of convenient illusions. The number of beings who wish to see truly is extraordinarily small.

Each man enters into God so much as God enters into him.