And any chance person-even a slave-can enjoy the bodily pleasures no less than the best man; but no one assigns to a slave a share in happiness-unless he assigns to him also a share in human life.
 Aristotle, Nicomachean Ethics (c. 334 BC - 330 BC). copy citation

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Author Aristotle
Source Nicomachean Ethics
Topic happiness pleasure
Date c. 334 BC - 330 BC
Language English
Reference
Note Translated by W. D. Ross
Weblink http://classics.mit.edu/Aristotle/nicomachaen.mb.txt

Context

“And we say that serious things are better than laughable things and those connected with amusement, and that the activity of the better of any two things-whether it be two elements of our being or two men-is the more serious; but the activity of the better is ipso facto superior and more of the nature of happiness. And any chance person-even a slave-can enjoy the bodily pleasures no less than the best man; but no one assigns to a slave a share in happiness-unless he assigns to him also a share in human life. For happiness does not lie in such occupations, but, as we have said before, in virtuous activities.
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If happiness is activity in accordance with virtue, it is reasonable that it should be in accordance with the highest virtue; and this will be that of the best thing in us.” source