Proverbs 20:26 A wise king scattereth the wicked, and bringeth the wheel over them.
27 The spirit of man is the candle of the LORD, searching all the inward parts of the belly.
28 Mercy and truth preserve the king: and his throne is upholden by mercy.
This first verse is kind of like the way they did wheat when they separated it from the chaff . They would run a ruff shod wheel over it to push the chaff out and it would be scattered by the wind. Likewise the king would sift out the bad people so he could keep his kingdom righteous.The second verse lets us see that God uses the spirit of man as a light to search out the the inward parts to determine which is good or bad.We are told by Jesus in Matthew 5:16 “Let your light so shine before men, that they may see your good works, and glorify your Father which is in heaven. God’s light shining within us separates us from darkness because that light is Jesus. This last verse tells us that if a leader wants to stay in power and be trusted by the people he needs to merciful and truthful in all things.