John Calvin on Jeremiah 17:10

By these words he means that they, after having for a long time made many evasions, would yet be brought to judgment, willing or unwilling; for they could not possibly deprive God of his right, that he should not be the judge of the world, and thus render to each the reward of his own works: for the Prophet does not speak of merits or of virtues, but only shews that how much soever the ungodly might hide themselves, they could not yet escape the tribunal of God, but that they must at last render an account to him.

We may further gather from this passage a general truth, — that the recesses of the heart are so hidden, that no judgment can be formed of man by any human being. We indeed know that there are appearances of virtue in many; but it belongs to God alone to search the hearts of men and to try the reins. Rashly then do many form an estimate of man’s character according to their own apprehensions or the measure of their own knowledge; for the heart of man is ever false and deceitful. If any one objects and says, that Jeremiah speaks of the Jews then living, there is an answer given by Paul,

“Whatsoever things are written in the Law pertain to all.” (Romans 15:4.)

Described then is here the character of all mankind, until God regenerates his elect. As then there is no purity except from the Spirit of God, as long as mencontinue in their own nature, their hearts are full of deceits and frauds. So the fairest splendor is nothing but hypocrisy, which is abominable in the sight of God. Let us proceed —

Jeremiah 17:11

11 As the partridge sitteth on eggs, and hatcheth them not; so he that getteth riches, and not by right, shall leave them in the midst of his days, and at his end shall be a fool.

11. Perdix quae congregat et non parit, qui facit (hoc est, acquirit, vel, comparat) divitias, idque non in judicio (id est, non recte) in medio dierum suorum relinquet illas, et in exitu suo erit nihili.