en_tn/pro/20/27.md

The spirit of a person is the lamp of Yahweh, searching all his inmost parts

This speaks of a person's spirit as if it were a lamp. A person's spirit helps him to understand his inner self. Alternate translation: "Yahweh has given us a spirit to understand our deepest selves, just as a lamp makes you see in the dark" (See: rc://en/ta/man/jit/figs-metaphor)