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Principal Doctrines is written by Epicurus and published by Lulu.com. It's available with International Standard Book Number or ISBN identification 1329869958 (ISBN 10) and 9781329869950 (ISBN 13).
Epicurus posited a materialistic physics, in which pleasure, by which he meant freedom from pain, is the highest good. Serenity, the harmony of mind and body, is best achieved, through virtue and simple living. In addition to the Principal Doctrines, included here is the essay Epicureanism by William De Witt Hyde and an Epicurus biography by Charles Bradlaugh.