Psalms 57:5

3. For as, among men, those sons who disobey their fathers, being disinherited, are still their sons in the course of nature, but by law are disinherited, for they do not become the heirs of their natural parents; so in the same way is it with God, those who do not obey Him being disinherited by Him, have ceased to be His sons. Wherefore they cannot receive His inheritance: as David says, “Sinners are alienated from the womb; their anger is after the likeness of a serpent.” And therefore did the Lord term those whom He knew to be the offspring of men “a generation of vipers;” because after the manner of these animals they go about in subtilty, and injure others. For He said, “Beware of the leaven of the Pharisees and of the Sadducees.” Speaking of Herod, too, He says, “Go ye and tell that fox,” aiming at his wicked cunning and deceit. …

6. “Indignation to them after the similitude of a serpent” ( ver. 4 ). A great thing ye are to hear. “Indignation to them after the similitude of a serpent.” As if we had said, What is that which thou hast said? there followeth, “As if of a deaf asp.” Whence deaf? “And closing its ears.” Therefore deaf, because it closeth its ears. “And closing its ears.” “Which will not hearken to the voice of men charming, and of the medicine medicated by the wise man” ( ver. 5 ). As we have heard, because even men speak who have learned it with such research as they were able, but nevertheless it is a thing which the Spirit of God knoweth much better than any men. For it is not to no purpose that of this he hath spoken, but because it may chance that true is even that which we have heard of the asp. …

11. And first of all, let us discipline our tongue to be the minister of the grace of the Spirit, expelling from the mouth all virulence and malignity, and the practice of using disgraceful words. For it is in our power to make each one of our members an instrument of wickedness, or of righteousness. Hear then how men make the tongue an instrument, some of sin, others of righteousness! “Their tongue is a sharp sword.” But another speaks thus of his own tongue: “My tongue is the pen of a ready writer.” The former wrought destruction; the latter wrote the divine law. Thus was one a sword, the other a pen, not according to its own nature, but according to the choice of those who employed it. For the nature of this tongue and of that was the same, but the operation was not the same. And again, as to the mouth likewise, we may see this same thing. …

Let us therefore take heed that it be not said of us, that our ears are those of a deaf adder. ( Ps. lviii. 4 .) For tell me, in what does a hearer of this kind differ from a beast? and how could he be otherwise than more irrational than any irrational animal, who does not attend when God is speaking? And if to be well-pleasing to God is really to be a man, what else but a beast can he be who will not even hear how he may succeed in this? Consider then what a misfortune it would be for us to fall down of our own accord from (the nature of) men to (that of) beasts, when Christ is willing of men to make us equal to angels. For to serve the belly, to be possessed by the desire of riches, to be given to anger, to bite, to kick, become not men, but beasts. Nay, even the beasts have each, as one may say, one single passion, and that by nature. …

Such are the lessons in which I have been trained and therefore I was unwilling to return bite for bite, and to attack you by way of retaliation; and I thought it better to exorcise the madness of one who was raving, and to pour in the antidote of a single book into his poisoned breast. But I fear I shall have no success, and that I shall be compelled to sing the song of David, and to take his words for my only consolation:

The best course you can take is to leave everything and to come to the East, before all to the holy places; for everything is now quiet here. The heretics have not, it is true, purged the venom from their breasts, but they do not venture to open their impious mouths. They are “like the deaf adder that stoppeth her ear.” Salute your reverend brothers on my behalf.

25. We both believe in and hear of the dregs of the anger of God, the residuum of His dealings with those who deserve it: For the Lord is a God of vengeance. For although He is disposed by His kindness to gentleness rather than severity, yet He does not absolutely pardon sinners, lest they should be made worse by His goodness. Yet my father kept no grudge against those who provoked him, indeed he was absolutely uninfluenced by anger, although in spiritual things exceedingly overcome by zeal: except when he had been prepared and armed and set in hostile array against that which was advancing to injure him. So that this sweet disposition of his would not, as the saying goes, have been stirred by tens of thousands. …

XXXIV. If you were full of leprosy, that shapeless evil, yet you scraped off the evil matter, and received again the Image whole. Shew your cleansing to me your Priest, that I may recognize how much more precious it is than the legal one. Do not range yourself with the nine unthankful men, but imitate the tenth. For although he was a Samaritan, yet he was of better mind than the others. Make certain that you will not break out again with evil ulcers, and find the indisposition of your body hard to heal. Yesterday meanness and avarice were withering your hand; to-day let liberality and kindness stretch it out. …