Psalm 139:13: For You formed my inward parts; you covered me in my mother’s womb.
God designed the process by which the baby is formed, protecting the little one (Latin, fetus) with the cover of his mother’s womb.
Psalm 139:14: I will praise You, for I am fearfully and wonderfully made; marvelous are Your works, and that my soul knows very well.
David rightly is in awe of the human body, and how “wonderfully” it is “made” in his “mother’s womb.”
Psalm 139:15: My frame was not hidden from You, when I was made in secret, and skillfully wrought in the lowest parts of the earth.
David praised God, for even as he developed in the womb, God could see his frame (Hebrew, skeleton, lit., bones) being knit together, “skillfully wrought,” in “my mother’s womb.” By the way, “the lowest parts of the earth” was a common Hebrew expression for “the womb,” as you can see from the reverse use of the idiom in Job 1:21.
Psalm 139:16 Your eyes saw my substance, being yet unformed. And in Your book they all were written, the days fashioned for me, when as yet there were none of them.
God saw me, who I really am, my substance, my soul-spirit interfaced to my body, all through the extraordinary DNA code which God wrote (which David had no concept of, but which as the author, God knew all about). So, from the moment of conception, “being yet unformed,” that is, just a single cell, in my mother’s womb (but not before conception!), God saw me, and knit me together, and in His book (of His instructions for my awesome development in the womb), all “the days fashioned for me,” that is, all the days which God decreed for the fashioning of a fetus, they were written and set from the very beginning, before a single day’s growth unfolded, even before the first cell divided into two, all 280 days of gestation, from that moment of fertilization!
