The spirit of man is the candle of the LORD, searching all the inward parts of the belly.
The spirit of man is the candle of the Lord - a candle or lamp lit by the Lord; a light divinely given to man. Conscience is this candle.
Searching all the inward parts of the belly - searching and discovering the inmost secrets of every man. Conscience is 'God in man'-a witness for God, acquitting or else condemning the man before himself, (Romans 2:14-15). It needs to be lit up by God's Word (Proverbs 6:23). Let us see that we be willing that our "inward parts" be all searched by the light, and no secret sin spared (John 3:21; Acts 24:16; Acts 23:1; 2 Corinthians 1:12; 1 John 3:20-21).