Charles H. Spurgeon on Psalms 139:11

If I say, Surely the darkness shall cover me. Dense darkness may oppress me, but it cannot shut me out from thee, or thee from me. Thou seest as well without the light as with it, since thou art not dependent upon light which is thine own creature, for the full exercise of thy perceptions. Moreover, thou art present with me whatever may be the hour; and being present you discover all that I think, or feel, or do. Men are still so foolish as to prefer night and darkness for their evil deeds; but so impossible is it for anything to be hidden from the Lord that they might just as well transgress in broad daylight.

Darkness and light in this agree;

Great God, they're both alike to thee.

Thine hand can pierce thy foes as soon

Through midnight shades as blazing noon.

A good man will not wish to be hidden by the darkness, a wise man will not expect any such thing. If we were so foolish as to make sure of concealment because the place was shrouded in midnight, we might well be alarmed out of our security by the fact that, as far as God is concerned, we always dwell in the light; for even the night itself glows with a revealing force, —even the night shall be light about me. Let us think of this if ever we are tempted to take license from the dark —it is light about us. If the darkness be light, how great is that light in which we dwell! Note well how David keeps his song in the first person; let us mind that we do the same as we cry with Hagar, "Thou God seest me."