Jeremiah 15:18

Now the so-called gods of the Greeks, unworthy of the name, are faithful neither in their essence nor in their promises, because they are not everywhere. The local deities amount to nothing over the course of time and undergo a natural extinction. For these reasons, the Word cries out against them, that "faith is not strong in them," that they are "waters that fail" and "there is no faith in them." But the God of all, who is indeed truly faithful, who is ever the same, says, "See now that I, even I am he," and "I change not." Therefore, his Son is "faithful," being ever the same and unchanging, deceiving neither in his essence nor in his promise, as is written by the apostle to the Thessalonians: "Faithful is he who calls you, who also will do it." For in doing what he promises, he is faithful to his words.

How then can one who is baptized among them seem to have obtained remission of sins and the grace of the divine mercy by his faith, when he has not the truth of the faith itself? For if, as some suppose, one could receive anything abroad out of the church according to his faith, certainly he has received what he believed. If he believes what is false, he could not receive what is true. Rather, he has received things adulterous and profane, according to what he believed. Jeremiah, the prophet, censures in detail this subject of profane and adulterous baptism, saying, "Why do those who grieve me prevail? My wound is incurable. When shall I be healed? When this is done, it is become for me as treacherous water not having faith." The Holy Spirit makes mention through the prophet of treacherous water also not having faith. What is this treacherous and faithless water? Assuredly it is that which asserts falsely the image of baptism and frustrates the grace of faith by its shadowy simulation.

"Why do those who hate me prevail?" He had many troubles; he suffered from those who did not wish to hear the truth, and those men were more powerful than he here in this age, since the kingdom of God is not from this age, but from the better regions, as the Savior says: "If my kingdom were of this world, my servants would have striven, that I should not be delivered to the Jews." Those, then, who grieved the prophet prevailed over him in this world. For that they do prevail, look at the martyrs. The judge sits giving judgment and living luxuriously in the tribunal; the Christian, in whom Christ is being judged, was filled with bitterness and is overpowered by the unjust man and is condemned. "My wound is firm, whence shall I be healed?" Those who prevail over me strike me, and my wound is firm. Whether he prophesies the cross of the Lord (for the cross is a firm wound, so far as concerns those who crucify him), or whether it is said concerning all the righteous in whom a firm wound is received, or whether you hear this also of the prophet (for he too suffered the things recorded in the prophecy) — it admits the same sense according to the expression that says: "My wound is firm." "Whence shall I be healed?" And if the Savior says, "Whence shall I be healed," he prophesies the resurrection from the dead after the firm wound; and if it is taken of the righteous man too, after the wounds there comes healing again. "Becoming, it became to me as deceitful water that has no faithfulness"; for the wound does not remain, but passes away.