John Trapp Complete Commentary
Proverbs 21:8
The way of man [is] froward and strange: but [as for] the pure, his work [is] right.
Ver. 8. The way of man is froward and strange.] And therefore strange, because froward, various, and voluble, so that you know not where to have him, be is so unconstant, nor what to make of him, he is so uncertain and unsettled; "double minded," Jam 1:8 double tongued; 1Ti 3:8 versutulus et versatilis -
“ Qui tantum constans in levitate sua. ”
Folieta Galeazo reports of Sforza, Duke of Milan, that he was a very monster, made up and compact of virtue and vice. Such of old were Alcibiades, and likewise Julian, the apostate, of whom Marcellinus saith, that by his vicious errors, obnubilabat gloriae multiplices cursus, he stained his many praiseworthy parts and practices. Galba, and our Richard III are said to have been bad men - good princes. And of King Henry VIII saith Mr Camden, Fuerunt quidem in eo rege magnae virtutes, nec minora vitia, confuso quodam temperamento mixtae - that is, there was a strange mixture of great virtues, and no less vices found in this king.
But as for the pure, his work is right.] For what reason? He works by rule, and therefore all his actions are uniform. He is also one and the same in all estates of life; as gold is purged in the fire, shines in the water. "Did I use lightness?" saith St Paul, "or is there with me yea yea, and nay nay?" No; "But as God is true, so our word toward you was not yea and nay?" 2Co 1:17-18 I did not say and unsay, do and undo, &c.