Know thyself? If I knew myself I would run away.

A school of art or of anything else is to be looked on as a single individual, who keeps talking to himself for a hundred years, and feels an extreme satisfaction with his own circle of favorite ideas, be they ever so silly.

The greater the knowledge, the greater the doubt.

Let him who believes in immortality enjoy his happiness in silence; he has no reason to give himself airs about it.

Few are open to conviction, but the majority of men are open to persuasion

Let us not dream that reason can ever be popular. Passions, emotions, may be made popular; but reason remains ever the property of an elect few.

Thought expands, but paralyzes; action animates, but narrows.