Someone else's action should not determine your response.

It is a mistake, too, to say that the face is the mirror of the soul. The truth is, men are very hard to know, and yet, not to be deceived, we must judge them by their present actions, but for the present only.

There are two levers for moving men, interest and fear.

Many a one commits a reprehensible action, who is at bottom an honourable man, because man seldom acts upon natural impulse, but from some secret passion of the moment which lies hidden and concealed within the narrowest folds of his heart.

I no longer listen to what people say, I just watch what they do. Behavior never lies.

The strongest knowledge (that of the total freedom of the human will) is nonetheless the poorest in successes: for it always has the strongest opponent, human vanity.