Insanity is often the logic of an accurate mind overtasked. Good mental machinery ought to break its own wheels and levers, if anything is thrust among them suddenly which tends to stop them or reverse their motion. A weak mind does not accumulate force enough to hurt itself; stupidity often saves a man from going mad.

Love is the master-key that opens the gates of happiness, of hatred, of jealousy, and, most easily of all, the gate of fear.

Don't flatter yourselves that friendship authorizes you to say disagreeable things to your intimates. On the contrary, the nearer you come into relation with a person, the more necessary do tact and courtesy become.

Love is the master key that opens the gates of happiness.

Fresh air is good if you do not take too much of it; most of the achievements and pleasures of life are in bad air.

Fame usually comes to those who are thinking about something else - very rarely to those who say to themselves, 'Go to, now, let us be a celebrated individual!'.

America is the only place where man is full-grown!