[19] Therefore, discarding all mention of those kinds of freedom which are only a pretence, and of all those names also which are quite unconnected with nature, but which owe their existence only to opinion, such as slaves born in the house, slaves purchased with money, slaves taken in war, let us now investigate the character of the man who is truly free, who is alone possessed of independence, even if ten thousand men set themselves down as his masters; for he will quote that line of Sophocles, which differs in no respect from the doctrines of the Pythagoreans— / "God is my ruler, and no mortal man." [3]