What does Psalm 139:14 mean?

Contemplating the fact that God wove him together in his mother's womb, David praised God for His omnipotent act of creation. He especially notes how God's creative power is beyond human comprehension.

The human body that God created in the womb is indeed wonderfully made. For instance, the heart beats about 70 times per minute and pumps about 2,000 gallons—7,500 liters—of blood per day. An average body contains nearly 100 trillion cells. The brain contains 100 billion nerve cells. Human kidneys process daily about 130 quarts—about 123 liters—of blood to filter out waste and water. Our skeletal system has 206 bones connected to an intricate system of tendons, cartilage, and ligaments. The skeletal system not only enables us to move but also helps to produce blood, and it stores calcium.

David recognized God's creation of man was both marvelous and distinct from the creation of everything else. No two persons are completely identical, and human beings are distinct from animals. David was fully convinced that God had fearfully and wonderfully made him. He wrote: "My soul knows it very well."