My frame was not hid from you, when I was made in secret, and skillfully wrought in the lowest parts of the earth.
All Commentaries on Psalms 139:15 Go To Psalms 139
Hippolytus of Rome
AD 235
It is said also by those who treat of the nature and generation of animals, that the change of the blood into bone is something invisible and intangible, although in the case of other parts, I mean the flesh and nerves, the mode of their formation may be seen. And the Scripture also, in Ecclesiastes, adduces this, saying, As you know not the bones in the womb of her that is with child, so you shall not know the works of God. But from You was not hid even my substance, as it was originally in the lowest parts of the earth.