Original Verse:
Proverbs Chapter 20 Verse 27The spirit of man is the lamp of Jehovah, Searching all his innermost parts.

Reference Verses:
1st Corinthians Chapter 2 Verse 11For who among men knoweth the things of a man, save the spirit of the man, which is in him? even so the things of God none knoweth, save the Spirit of God.
Matthew Chapter 6 Verse 22The lamp of the body is the eye: if therefore thine eye be single, thy whole body shall be full of light.