Quote From: Reeve, C.D.C. and Patrick L. Miller. Introductory Readings in Ancient Greek and Roman Philosophy. 2006. Hackett Publishing Co.Indianapolis/Cambridge. P.334.
Aristotle said: “We think pleasure must be mixed into happiness; and it is agreed that the activity expressing wisdom is the pleasantest of the activities expressing virtue. At any rate, philosophy seems to have remarkably pure and firm pleasures; and it is reasonable for those who have knowledge to spend their lives more pleasantly than those who seek it.” Nicomachean Ethics X, 7, 1177a 25
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