John Gills Exposition of the Bible Commentary - Proverbs 17:3
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... read more
Matthew Henry's Complete Commentary - Proverbs 17:3
Note, 1. The hearts of the children of men are subject, not only to God's view, but to his judgment: As the fining-pot is for silver, both to prove it and to improve it so the Lord tries the hearts; he searches whether they are standard or no, and those that are he refines and makes purer, Jer. 17:10. God tries the heart by affliction (Ps. 66:10, 11), and often chooses his people in that furnace (Isa. 48:10) and makes them choice. 2. It is God only that tries the hearts. Men may try their... read more