"Now, as our Lord above says, 'Everyone who commits sin is sin's slave', and that is why, though many devout men are slaves to unrighteous masters, yet the masters they serve are not themselves free men; 'for when a man is conquered by another he is also bound as a slave to his conqueror.' And obviously it is a happier lot to be a slave to a human being than to a lust; and in fact, the most pitiless domination that devastates the hearts of men, is that exercised by this very lust for domination, to mention no others."
St. Augustine, City of God