We ought to flee the friendship of the wicked, and the enmity of the good.

If what charms you is nothing but abstract principles, sit down and turn them over quietly in your mind: but never dub yourself a Philosopher.

Desire and happiness cannot live together.

We tell lies, yet it is easy to show that lying is immoral.

Every difficulty in life presents us with an opportunity to turn inward and to invoke our own submerged inner resources. The trials we endure can and should introduce us to our strengths.

No man is able to make progress when he is wavering between opposite things.

You will do the greatest service to the state if you shall raise, not the roofs of the houses, but the souls of the citizens: for it is better that great souls should dwell in small houses rather than for mean slaves to lurk in great houses.