What then can be more wretched? when the very evil, which God threatens in the way of punishment, this thou art drawing upon thine head of thine own accord, bringing into thy soul a sort of grievous famine, and making it the feeblest thing in the world? For it is its nature both to be wasted and to be saved by words. Yea, this leads it on to anger; and the same kind of thing again makes it meek: a filthy expression is wont to kindle it to lust, and it is trained to temperance by speech full of gravity.