Of what use is a philosopher who doesn't hurt anybody's feelings?

We have complicated every simple gift of the gods.

Protagoras asserted that there are two sides to every question, exactly opposite to each other.

It was a favorite expression of Theophrastus that time was the most valuable thing that a man could spend.

One original thought is worth a thousand mindless quotings

As a matter of self-preservation, a man needs good friends or ardent enemies, for the former instruct him and the latter take him to task.

Those who have virtue always in their mouths, and neglect it in practice, are like a harp, which emits a sound pleasing to others, while itself is insensible of the music.