On Rewards and Punishments (115-116)

and I say this with reference to those who wish to imitate models of excellent and admirable beauty, that they may not despair of a change for the better, nor of an alteration and improvement from that dispersion, as it were, of the soul which vice engenders, so that they may be able to effect a return to virtue and wisdom.

For when God is favourable every thing is made easy. And he is favourable to those who display modesty and due reverence, and who seek to pass over from intemperance to temperance, and who reproach themselves for all the blameable actions of their life, and for all the base images which they have stamped upon their polluted souls, and who aim at a tranquil state of the passions, and who keep constantly in view, as the proper object of their pursuit, a calmness and serenity of life.