Proverbs 20:27
The spirit of man - The "breath" of Genesis 2:7, the higher life, above that which he has in common with lower animals, coming to him direct from God. Such a life, with all its powers of insight, consciousness, reflection, is as a lamp which God has lighted, throwing its rays into the darkest recesses of the heart. A still higher truth is proclaimed in the Prologue of John' s Gospel. The candle, or lamp of Yahweh, derives its light from "the Light that lighteth every man," even the Eternal Word.
