Thomas Aquinas

Here he threatens them with the punishment of confusion: and you shall be confounded by Egypt, in whose help you hope, by Assyria, whose help you sought against the ten tribes and the Assyrians, 4 Kings 16. Your hands shall be upon your head, as a sign of sorrow. Isaiah 30: the strength of Pharaoh shall be to you unto confusion, and the trust in the shadow of Egypt unto disgrace. It should be noted, that sin is called vanity, because it is illusory in being chosen. Psalm 39: Blessed is the man whose hope is the name of the Lord, and who has not looked upon vanities and false follies. Because it is transitory in enduring. Psalm 77: their days failed away in vanity, and their years in haste. Because it is deceptive in being awaited. Ecclesiasticus 34: vain hope and a lie to a foolish man, and dreams lift up the imprudent. Because it is fruitless in being attained. Isaiah 49: I have labored in vain, I have spent my strength without cause and in vain. Likewise it should be noted, that there is a fountain of the water of sacramental cleanness. Ezekiel 47: after these waters have come there, all things shall be healed and shall live, to which the torrent has come. The water of refreshing doctrine. Isaiah 55: All you who thirst, come to the waters; and you who have no money, make haste, buy and eat. The water of cooling grace. John 4: there shall be made in him a fountain of water springing up into life everlasting. The water of shining glory. Apocalypse, last chapter: he showed me a river of living water, shining like crystal, proceeding from the throne of God and of the Lamb.