Proverbs 21:1 - Clarke's commentary and critical notes on the Bible

The king's heart is in the hand of the LORD, as the rivers of water: he turneth it whithersoever he will. The king's heart is in the hand of the Lord - The Lord is the only ruler of princes. He alone can govern and direct their counsels. But there is an allusion here to the Eastern method of watering their lands. Several canals are dug from one stream; and by opening a particular sluice, the husbandman can direct a stream to whatever part he please: so the king's heart, wherever it turns; i.e., to whomsoever he is disposed to show favor. As the land is enriched with the streams employed in irrigation; so is the favourite of the king, by the royal bounty: and God can induce the king to give that bounty to whomsoever he will. See Harmer.