The ultimate value of life depends upon awareness and the power of contemplation rather than upon mere survival.

The secret to humor is surprise.

For one swallow does not make a summer, nor does one day; and so too one day, or a short time, does not make a man blessed and happy.

All human actions have one or more of these seven causes: chance, nature, compulsions, habit, reason, passion, desire.

A friend to all is a friend to none.

I count him braver who overcomes his desires than him who conquers his enemies; for the hardest victory is over self.

Those who educate children well are more to be honored than they who produce them; for these only gave them life, those the art of living well.

The one exclusive sign of thorough knowledge is the power of teaching.

Good habits formed at youth make all the difference.

The worst form of inequality is to try to make unequal things equal.