Acts 2:37

“And when the multitudes exclaimed, "What shall we do then? "Peter says to them, "Repent, and be baptized everyone of you in the name of Jesus for the remission of sins, and ye shall receive the gift of the Holy Ghost." Thus the apostles did not preach another God, or another Fulness; nor, that the Christ who suffered and rose again was one, while he who flew off on high was another, and remained impossible; but that there was one and the same God the Father, and Christ Jesus who rose from the dead; and they preached faith in Him, to those who did not believe on the Son of God, and exhorted them out of the prophets, that the Christ whom God promised to send, He sent in Jesus, whom they crucified and God raised up.”

“Do you see what a great thing gentleness is? More than any vehemence, it pricks our hearts, inflicts a keener wound. For as in the case of bodies which have become callous the man that strikes upon them does not affect the sense so powerfully, but if he first mollify them and make them tender, then he pierces them effectually; so in this instance also, it is necessary first to mollify. But that which softens, is not wrath, not vehement accusation, not personal abuse; it is gentleness. The former indeed rather aggravate the callousness, this last alone removes it. If then you are desirous to reprove any delinquent, approach him with all possible mildness. For see here; he gently reminds them of the outrages they have committed, adding no comment; he declares the gift of God, he goes on to speak of the grace which bore testimony to the event, and so draws out his discourse to a still greater length. So they stood in awe of the gentleness of Peter, in that he, speaking to men who had crucified his Master, and breathed murder against himself and his companions, discoursed to them in the character of an affectionate father and teacher. Not merely were they persuaded; they even condemned themselves, they came to a sense of their past behavior. For he gave no room for their anger to be roused, and darken their judgment, but by means of humility he dispersed, as it were, the mist and darkness of their indignation, and then pointed out to them the daring outrage they had committed.”

“For so it is; when we say of ourselves that we are injured, the opposite party endeavor to prove that they have not done the injury; but when we say, we have not been injured, but have rather done the wrong, the others take the contrary line. If, therefore, you wish to place your enemy in the wrong, beware of accusing him; nay, plead for him, he will be sure to find himself guilty. There is a natural spirit of opposition in man. Such was the conduct of Peter. He did not accuse them harshly; on the contrary, he almost endeavored to plead for them, as far as was possible. And this was the very reason that he penetrated into their souls. You will ask, where is the proof that they were pricked? In their own words; for what say they? "Men and brethren, what shall we do?" Whom they had called deceivers, they call "brethren:" not that hereby they put themselves on an equality with them, but rather by way of attracting their brotherly affection and kindness: and besides, because the Apostles had deigned to call them by this title.”

“And, say they, "What shall we do?" They did not straightway say, Well then, we repent; but they surrendered themselves to the disciples. Just as a person on the point of shipwreck, upon seeing the pilot, or in sickness the physician, would put all into his hands, and do his bidding in everything; so have these also confessed that they are in extreme peril, and destitute of all hope of salvation. They did not say, How shall we be saved? but, "What shall we do?"”

“For on the sending down of the Holy Spirit after the Lord's passion, and resurrection, and ascension, when miracles were being done in the name of Him whom, as if dead, the persecuting Jews had despised, they were pricked in their hearts; and they who in their rage slew Him were changed and believed; and they who in their rage shed His blood, now in the spirit of faith drank it; to wit, those three thousand, and those five thousand Jews whom now He saw there, when He said, "When ye have lifted up the Son of man, then shall ye know that I am [He]." It was as if He had said, I let your recognition lie over till I have completed my passion: in your own order ye shall know who I am. Not that all who heard Him were only then to believe, that is, after the Lord's passion; for a little after it is said, "As He spake these words, many believed on Him;" and the Son of man was not yet lifted up. But the lifting up He is speaking of is that of His passion, not of His glorification; of the cross, not of heaven; for He was exalted there also when He hung on the tree. But that exaltation was His humiliation; for then He became obedient even to the death of the cross. This required to be accomplished by the hands of those who should afterwards believe, and to whom He says, "When ye have lifted up the Son of man, then shall ye know that I am [He]." And why so, but that no one might despair, however guilty his conscience, when he saw those forgiven their homicide who had slain the Christ?”

“And having heard this, they were cut to the heart, etc. See the prophecy of Joel fulfilled, the flesh following the fire of the Holy Spirit, compunction's vapor follows. For smoke tends to produce tears. They begin to weep who had laughed, they beat their chest, they give their prayer to God as a sacrifice, so they might taste the blood of salvation, which they had previously invoked upon themselves and their children to their condemnation. It follows:”

“You see how much condescension there is and how it is more capable than severity of penetrating the hearts of people and softening them. Although the blessed Peter does remind them in this passage of their audacities, he reminds them gently, adding nothing offensive to them. They were ashamed of Peter's condescension, that is, of the fact that with them—who had put to death the Lord Himself, who had raised their hands against the apostles and wished to destroy them—Peter spoke with care, as a father and teacher. "They were cut to the heart," it says: they were not simply convinced, but came to know themselves, for they say: "What shall we do, men and brethren?"—as if being at a loss and anxious about their audacities. Those whom they formerly called deceivers they now call brethren, and yet they do not dare to use this title before the face of those whom they so call, but wish to declare through it their love and how strongly the Jews had become disposed toward the apostles. Therefore, as the beginning of Peter's speech shows, the apostles themselves also called them by this name.”

“Peter's speech, moderated with gentleness, led them to regret. The phrase "they were pierced" (κατενύγησαν), instead of "they were struck" (ἐπλήγησαν), indicates that they suffered inwardly and judged themselves. Therefore they seek a remedy for the evil, and affectionately call them brothers, those whom they formerly mocked. The address "brothers" was not said out of equality, as if presenting themselves to them by such a form of address, but showing how they had grown fond of them. And since Peter, beginning his discourse, called them so, they also thereby had an occasion to call them in the same way.”