178. For neither is that city, the heavenly Jerusalem, watered by the channel of any earthly river, but that Holy Spirit, proceeding from the Fount of Life, by a short draught of Whom we are satiated, seems to flow more abundantly among those celestial Thrones, Dominions and Powers, Angels and Archangels, rushing in the full course of the seven virtues of the Spirit. For if a river rising above its banks overflows, how much more does the Spirit, rising above every creature, when He touches the as it were low-lying fields of our minds, make glad that heavenly nature of the creatures with the larger fertility of His sanctification.