19. And again in your bed-chamber itself, I would have you join psalms in frequent interchange with the Lord’s prayer, either when you wake up, or before sleep bedews your body, so that at the very commencement of rest sleep may find you free from the care of worldly matters, meditating upon the things of God. And, indeed, he who first found out the name of Philosophy itself, Pythagoras. every day before he went to rest, had the flute-player play softer melodies to soothe his mind disturbed by worldly cares. But he, like a man washing tiles, fruitlessly desired to drive away worldly things by worldly means, for he was, indeed, rather besmearing himself with fresh mud, in seeking a reward from pleasure, but let us, having wiped off the filth of earthly vices, purify our utmost souls from every defilement of the flesh.