From: The Golden Sayings of Epictetus (translated by Hastings Crossley) - from Project Gutenberg.
CXXXV
Reflect that the chief source of all evils to Man, and of baseness and cowardice, is not death, but the fear of death.
Against this fear then, I pray you, harden yourself; to this let all your reasonings, your exercises, your reading tend. Then shall you know that thus alone are men set free.