12 Even the dark is not dark to you; the night is as bright as the day: for dark and light are the same to you.
There is no dark place, and no thick cloud, in which the workers of evil may take cover.
He is the unveiler of deep and secret things: he has knowledge of what is in the dark, and the light has its living-place with him.
And the people kept their places far off, but Moses went near to the dark cloud where God was.
The underworld is uncovered before him, and Destruction has no veil.
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Commentary on Psalms 139 Matthew Henry Commentary
Psalm 139
Some of the Jewish doctors are of opinion that this is the most excellent of all the psalms of David; and a very pious devout meditation it is upon the doctrine of God's omniscience, which we should therefore have our hearts fixed upon and filled with in singing this psalm.
This great and self-evident truth, That God knows our hearts, and the hearts of all the children of men, if we did but mix faith with it and seriously consider it and apply it, would have a great influence upon our holiness and upon our comfort.
To the chief musician. A psalm of David.
Psa 139:1-6
David here lays down this great doctrine, That the God with whom we have to do has a perfect knowledge of us, and that all the motions and actions both of our inward and of our outward man are naked and open before him.
Psa 139:7-16
It is of great use to us to know the certainty of the things wherein we have been instructed, that we may not only believe them, but be able to tell why we believe them, and to give a reason of the hope that is in us. David is sure that God perfectly knows him and all his ways,
Psa 139:17-24
Here the psalmist makes application of the doctrine of God's omniscience, divers ways.