The man who owns a slave, or lives by exploiting others, whether slave or not, is not himself a free man. He is a man who must look over his shoulder all the time, in fear. True freedom lies in a deep concern for the freedom of others, and if this is accepted it should make every man, out of pure selfishness, the ardent devotee of the freedom of his neighbor. — Leonard Wibberly, 1776 – And All That (1975), p. 72.