Proverbs 17:3
The fining pot is for silver, and the furnace for gold: but the LORD trieth the hearts.
The fining pot is for silver, and the furnace for gold,.... Refiners of silver have their fining pots, in which they purify the silver from the dross; and goldsmiths have their crucibles to melt and purify their gold, by which assays of the worth and value of it may be made;
but the LORD trieth the hearts; there is no vessel, as Gersom observes, in which they can be put and tried by creatures; a man does not know, nor can he thoroughly search and try his own heart, and much less the hearts of others; God only knows and tries them, Jeremiah 17:9; The Septuagint, Vulgate Latin, and Arabic versions, render it by way of similitude, "as the fining pot is for silver", &c. as silver is refined in the pot, and gold in the furnace, so are the hearts of God's people, and their graces tried and purified by him in the furnace of affliction; the variety of troubles they are exercised with are made useful for the purging away of the dross of sin and corruption, and for the brightening of their graces, 1 Peter 1:7.