139:15 My substance. This refers to the basic frame or skeleton. Note also the similar testimony in Ecclesiastes 11:5. The marvels of embryonic growth are still largely unexplained by scientists, but God knows!
139:15 curiously wrought. “Curiously wrought” means “embroidered,” a striking description of the double-helical DNA molecular program, which organizes part by part the beautiful structure of the whole infant.
139:15 lowest parts. For “lowest parts,” read “nether parts,” or “hidden parts.” God made these hidden parts, or elements, of the earth, then formed Adam’s body from this “dust of the earth” (Genesis 2:7). He created within the body of Adam and Eve the marvelous and complex ability to multiply that body, finally to generate from these lowest parts of the earth through the curiously wrought embroidery of DNA all the many billions of their descendants, including David himself.