Not to be mad is another form of madness

No one is discontented at not being a king except a discrowned king ... unhappiness almost invariably indicates the existence of a road not taken, a talent undeveloped, a self not recognized.

All man's troubles come from not knowing how to sit still in one room.

You always admire what you really don't understand.

There is no arena in which vanity displays itself under such a variety of forms as in conversation.

We see neither justice nor injustice which does not change its nature with change in climate. Three degrees of latitude reverse all jurisprudence; a meridian decides the truth.

All the troubles of life come upon us because we refuse to sit quietly for a while each day in our rooms.