Bear in mind that the measure of a man is the worth of the things he cares about.

Your mind will be like its habitual thoughts; for the soul becomes dyed with the color of its thoughts. Soak it then in such trains of thoughts as, for example: Where life is possible at all, a right life is possible.

Everything - a horse, a vine - is created for some duty... For what task, then, were you yourself created?

Live not one's life as though one had a thousand years, but live each day as the last.

You should banish any thoughts of how you may appear to others.

Can we wonder that men perish and are forgotten, when their noblest and most enduring works decay? Death comes even to monumental structures, and oblivion rests on the most illustrious names.

Since you are an integral part of a social system, let every act of yours contribute to the harmonization of social life. Any action that is not related directly or remotely to this social aim disturbs your life, and destroys your unity.