The interpretation timeline
2 Samuel 12:7 Douay-Rheims

And Nathan said to David: Thou art the man. Thus saith the Lord the God of Israel: I anointed thee king over Israel, and I delivered thee from the hand of Saul,

A.D. 407 – 1871 5 witnesses

Patristic

before A.D. 750
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“Therefore, Nathan went to David and wove a dramatic act for judgment. And what did he say? "My king, I want your judgment. There was a certain rich man and a certain poor one. The rich person possessed herds of cattle and many other flocks; and the poor one had one ewe that drank from his glass, ate from his table and slept in his embrace." Here Nathan revealed the genuine bond between a husband and wife. "When a certain stranger arrived, the rich man desired to keep his own animals, and he took the poor man's ewe and slaughtered her." Here, do you see how Nathan wove the dramatic act, mysteriously concealing the weapon in the glands of David's throat? Then what did the king say? Thinking that he had to pass judgment against someone else, he decided most severely. For such are human beings. When it concerns other people, they gladly and abruptly render decisions and publicize them. And what did David say? "As the Lord lives, the man who did this thing is worthy of death. And he shall restore the lamb fourfold." Therefore, what did Nathan reply? He did not allow the wound to be relieved for many hours; rather, he quickly stripped it naked and sharply embedded the knife deeply into it, so as not to rob it of the painful sensation. "You are the man, my king." What did the king say? "I have sinned against the Lord." He did not say, "Who are you who censures me? Who sent you to speak with such boldness? With what daring did you prevail?" He did not say anything of the sort; rather, he perceived the sin. And what did he say? "I have sinned against the Lord." Therefore, what did Nathan say to him? "And the Lord remitted your sin." You condemned yourself; I [God] remit your sentence. You confessed prudently; you annulled the sin. You appropriated a condemnatory decision against yourself; I repealed the sentence. Can you see that what is written in Scripture was fulfilled: "Be the first one to tell of your transgression so you may be justified" How toilsome is it to be the first one to declare the sin?”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And I gave thee thy master's house,.... Not his palace at Gibeah, but rather his family, his wives, servants, wealth, and riches, all being confiscated through the rebellion of Ishbosheth; or rather his kingdom he succeeded him in: and thy master's wives into thy bosom; though we read of no more than one that belonged to Saul, if he is meant by his master, excepting Rizpah his concubine, nor ever of David taking them into his bosom and bed; wherefore this can be understood only of his having them at his disposal, to give them to whom he pleased; the word may be rendered his "women", as well as his "wives", and may design his daughters, Merab and Michal, who were both given to David, though taken again and given to others: the Jews say, that Eglah, David's sixth wife, was the wife of Saul; see Gill on Sa2 3:5, and gave thee the house of Israel and of Judah; the kingdom of both; gave him to be king over all the tribes of Israel: and if that had been too little; either his wives too few, as the Jews interpret it, or his kingdom too small: I would moreover have given unto thee such and such things; more and greater favours; and indeed such he had promised him, as a firm or stable house or kingdom, and that the Messiah should spring from him.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“Thou art the man - What a terrible word! And by it David appears to have been transfixed, and brought into the dust before the messenger of God. Thou Art this son of death, and thou shalt restore this lamb Fourfold. It is indulging fancy too much to say David was called, in the course of a just Providence to pay this fourfold debt? to lose four sons by untimely deaths, viz., this son of Bath-sheba, on whom David had set his heart, was slain by the Lord; Amnon, murdered by his brother Absalom; Absalom, slain in the oak by Joab; and Adonijah, slain by the order of his brother Solomon, even at the altar of the Lord! The sword and calamity did not depart from his house, from the murder of wretched Amnon by his brother to the slaughter of the sons of Zedekiah, before their father's eyes, by the king of Babylon. His daughter was dishonored by her own brother, and his wives contaminated publicly by his own son! How dreadfully, then, was David punished for his sin! Who would repeat his transgression to share in its penalty? Can his conduct ever be an inducement to, or an encouragement in, sin? Surely, No. It must ever fill the reader and the hearer with horror. Behold the goodness and severity of God! Reader, lay all these solemn things to heart.”
Source
1849
A.D.
1774–1849
“The man, against whom thou hast pronounced sentence, and who has treated thy neighbour with still less pity. (Haydock) —– Mutato nomine de te Fabula narratur.—– (Horace)”
1871
A.D.
1871
“HE APPLIES IT TO DAVID, WHO CONFESSES HIS SIN, AND IS PARDONED. (Sa2 12:7-23) Nathan said to David, Thou art the man--These awful words pierced his heart, aroused his conscience, and brought him to his knees. The sincerity and depth of his penitent sorrow are evinced by the Psalms he composed (Psa 32:1-11; Psa. 51:1-19; Psa. 103:1-22). He was pardoned, so far as related to the restoration of the divine favor. But as from his high character for piety, and his eminent rank in society, his deplorable fall was calculated to do great injury to the cause of religion, it was necessary that God should testify His abhorrence of sin by leaving even His own servant to reap the bitter temporal fruits. David was not himself doomed, according to his own view of what justice demanded (Sa2 12:5); but he had to suffer a quadruple expiation in the successive deaths of four sons, besides a lengthened train of other evils.”
Source
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.