Unto the upright there ariseth light in the darkness. God's Word is "a lantern unto their feet, and a light unto their paths" (Psalms 119:105)—sufficient under most circumstances to guide their steps aright.
When this is not enough, he vouchsafes an inward light to them (Psalms 27:1; Psalms 36:9; Isaiah 58:10; Isaiah 49:6, etc.). He is gracious, and full of compassion, and righteous. It is a very forced interpretation to understand this as said of Jehovah.
The entire subject of the psalm is the righteous, God-like man. In him are reflected shadows of all the Divine qualities.