[91] For by the following means alone can that which is most excellent within us become adapted for and inclined to the service of him who is the most excellent of all existing beings. In the first place, if man be resolved into soul, the body, which is akin to it as a brother, being separated and cut off from it, and also all its insatiable desires; and in the second place when the soul has, as I have already said, cast off the irrational part, which is the neighbour of the rational part; for this, like a torrent, being divided into five channels, excites the impetuosity of the passions through all the external senses, as so many aqueducts.