For you yourself produced my kidneys; you kept me screened off in the belly of my mother.

Ps. 139:8, 12-14.

4. To make what point did the psalmist David here mention the kidneys?

⁴ Well, now, why did King David specially mention the kidneys? It was in order to make his point. He was magnifying the depth of penetration on the part of God’s spirit and visual powers, reaching as far down as into Sheol, the common grave of mankind. God can also peer down deep into the human body, as far down as the kidneys, these being below the heart and the diaphragm and toward the base of the spine. And when God created the embryo and kept it screened off in the belly of David’s mother, he could see down to the location for these deep-seated organs. Nothing blocked his visual powers or the range of his creative spirit.