29 “You, Lord, in the beginning hast laid the foundation of the earth: and the Heavens are the work of Your hands”....God laid the foundation of the earth, we know: the heavens are the works of His hands. For do not imagine that God does one thing with His hand, another by His word. What He does by His word, He does by His hand: for He has not distinct bodily members, who said, “I Am That I Am.” And perhaps His Word is His hand, assuredly His hand is His power. For inasmuch as it is said, “Let there be a firmament,” and there was a firmament; He is understood to have created it by His Word; but when He said, “Let Us make man in Our image, after Our likeness;” He seems to have created him by His hand. Hear therefore: “The heavens are the work of Your hands.” Lo, what He created by His word, He created also by His hands; because He created them through His excellence, through His power. Observe rather what He created, and seek not to know in what manner He created them. It is much to you to understand how He created them, since He created yourself so, that you may first be a servant obeying, and afterwards perhaps a friend understanding.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)