Shineth, or enlighteneth, as this word is used, Psalms 19:8 Proverbs 29:13, &c.; discovereth me and all mine actions. The darkness and the light are both alike to thee: this is repeated so oft to reprove and confute the ridiculous conceits of many ungodly men, who flatter themselves with hopes of secrecy and impunity for those sins which they commit in the dark. See Isaiah 29:15.
Related Commentaries of Psalms 139:12
Psalms 139:12
12 Yea, the darkness hidethb not from thee; but the night shineth as the day: the darkness and the light are both alike to thee.