Wonderful as is the separation of the pure metal from the dross with which it has mingled, there is something yet more wonderful in the divine discipline which purifies the good that lies hid, like a grain of gold, even in rough and common natures, and frees it from all admixture of evil. Compare Mal 3:2; 1 Peter 1:7.
Related Commentaries of Proverbs 17:3
Proverbs 17:3
3 The fining pot is for silver, and the furnace for gold: but the LORD trieth the hearts.