De Somniis (lib. i-ii)

What, then, is the good? The passion which is attacking us is dead, and is thrown out on its face without burial. Let not us delay, but standing still, let us sing that most sacred and becoming hymn, feeling that we are commanded to say to all men, "Let us sing unto the Lord, for he has triumphed gloriously; the horse and his rider hath he thrown into the sea." [*](Exodus xv. 1. )

But the rout and destruction of the passions is indeed a good, but not a perfect good; but the discovery of wisdom is a surpassing good, and when that is found all the people will sing harmonies and melodies, not with one kind of music only, but with every sort;