Self-knowledge is no guarantee of happiness, but it is on the side of happiness and can supply the courage to fight for it.
We have all a better guide in ourselves, if we would attend to it, than any other person can be.
Self-knowledge comes from knowing other men.
Only the shallow know themselves.
Not all those who know their minds know their hearts as well.[Tous ceux qui connaissent leur esprit ne connaissent pas leur coeur.]
I am the only person in the world I should like to know thoroughly; but I don’t see any chance of it just at present.