PhilosophyQuotes for February 13, 2000:

"Men are disturbed, not by things, but by the principles and notions which they form concerning things."

"...it is difficult to both keep your faculty of choice in a state conformable to nature, and at the same time acquire external things."

"Whatever moral rules you have deliberately proposed to yourself, abide by them as they were laws, and as if you would be guilty of impiety by violating any of them. Don't regard what anyone says of you, for this, after all, is no concern of yours."

-Epictetus (c.55-c.135), The Enchiridion

Epictetus' Enchiridion is available online at Amazon.com.