For you formed my inward parts; you knitted me together in my mother’s womb.
PSALM 139 In this Psalm David, that he may dismiss the deceptive coverings under which most men take refuge, and divest himself of hypocrisy, insists at large upon the truth that nothing can elude the divine observation — a truth which he illustrates from the original formation of man, since he who fashioned us in our mother’s womb, and imparted to every member its particular...
Commenting on Psalm 139:1-24
For thou hast possessed my reins. Thou art the owner of my inmost parts and passions: not the indweller and observer only, but the acknowledged lord and possessor of my most secret self. The word "reins" signifies the kidneys, which by the Hebrews were supposed to be the seat of the desires and longings; but perhaps it indicates here the most hidden and vital portion...
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, I. Because he is always under his eye.
Commenting on Psalm 139:7-16