Matthew Poole and continuators on 2 Samuel 12:12

12 For thou didst it secretly: but I will do this thing before all Israel, and before the Sun.

i. e. I will Execute this Judgment. This God did by inclining David's Heart to leave his Concubines, to keep his House, and so to come into Absalom's Power, by giving up Achitophel to his own Carnal Policy, which readily suggested to him that wicked and desperate Counsel; and by exposing Absalom to these Temptations, and leaving him to his own Vicious Inclinations, which God certainly knew would in such circumstances produce that Effect. So the Sin was wholly from Men; but the ordering and over-ruling their Mistakes and Miscarriages to this end, was from God.