This psalm teaches us that God is Lord over all and everything - the heavens and the earth. It shows us that as human beings we are very important and special to God. Jesus humbled Himself and became lower than His position in order to save all mankind and reconcile us back to the Father. Our responsibility is to rule and cultivate the land. As Genesis 1v28 says: 'God blessed them and said to them, "Be fruitful and increase in number; fill the earth and subdue it. Rule over the fish of the sea and the birds of the air and over every living creature that moves on the ground."'