Proverbs 20:21 - Joseph Benson’s Commentary on the Old and New Testaments

An inheritance may be gotten hastily An estate is sometimes soon gained, even in the very beginning of a man's labours for it: in which case, it may be presumed that some indirect and unrighteous means have been used for the getting of it, because riches are very seldom given by God, or gotten by men, without men's diligence. But this, as well as many other proverbs, are to be understood of the common course of things, which may admit of many exceptions. For sometimes merchants or others gain a large property speedily, suppose by a successful voyage, or by some other prosperous event. But the end thereof shall not be blessed Namely, the end of what was not righteously obtained: it was suddenly raised, and shall be as suddenly ruined: it shall wither by God's just judgment, and come to nothing.