Whatever injury wicked men-in-power inflict upon good men is to be regarded ... as a test for the good man's virtues. Thus, a good man, though a slave, is free; but a wicked man, though a king, is a slave. For, a wicked man serves not just one master, but, what's worse, as many masters as he has vices. For, it is in reference to vice that the Holy Scripture says: "For by whom a man is overcome, of the same also he is the slave" (2 Peter 2:19).