The interpretation timeline
2 Samuel 12:12 Douay-Rheims

For thou didst it secretly: but I will do this thing in the sight of all Israel, and in the sight of the sun.

A.D. 407 – 1849 4 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 You appropriated a condemnatory decision against yourself; I repealed the sentence.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
430
A.D.
Augustine of Hippo Patristic
A.D. 354–430
“Thus, the prophets' sayings are of three classes: one class refers to the earthly, a second to the heavenly Jerusalem, and a third to both simultaneously. It will be best to support this assertion with illustration. The prophet Nathan was sent to accuse King David of a grave sin and to foretell what evils were to befall him on this account. Now no one can fail to see that this prophecy refers to the earthly city. There are others like it, sometimes addressed to the people at large for their profit and well-being, and sometimes to an individual who merited a word from God to foreknow some event for the guidance of his temporal life.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And David said unto Nathan, I have sinned against the Lord,.... Which confession, though short, was a full one, arising from a thorough conviction of the evil of the sin he had been guilty of, accompanied with real brokenness of heart, sincere humiliation, and a sorrow after a godly sort, as the fifty first psalm, that penitential psalm composed upon this occasion shows, Psa 51:1, and Nathan said unto David; being fully satisfied with the sincerity and genuineness of his repentance, of which he gave proof by words and deeds, and being under the direction and impulse of the Spirit of God: the Lord hath put away thy sin; would not charge it upon him, impute it to him, or punish him for it, but freely and fully forgive it, cast it behind his back, and into the depth of the sea; cause it to pass from him and never more bring it against him, and which is the Lord's act, and his only, against whom sin is committed: thou shall not die; though he should die a corporeal death, yet not by the immediate hand of God, or by the sword of justice as a malefactor, a murderer, and adulterer, as he, according to the law, deserved to die; nor should he die a spiritual death, though his grace had been so low, and his corruptions had risen so high; nor an eternal death, the second death, the lost wages of sin.”
Source
1849
A.D.
1774–1849
“Sun, publicly, chap. xvi. 22. How abominable soever this conduct of an unnatural son must have been to God, he says, I will do this; because, when he might have prevented it by a more powerful grace, or by the death of the delinquent, he suffered him to carry his infernal project into execution. (Haydock)”
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.