104:2 coverest thyself with light. This 104th psalm gives unique insight into the mysteries of God’s creation, from its first beginnings to the great Flood, to the providential care of His creation in the present world and to the consummation. “God is light” (I John 1:5), so light did not have to be created, as did darkness (Isaiah 45:7); it needed merely to be “formed” in such fashion as to provide divine apparel for the Creator as He entered, as it were, into His physical universe when He created it.
104:2 stretchest out the heavens. The “heavens” are simply the infinite reaches of created “space” in His space/mass/time universe. The “stretching out” may refer either to their limitless extent, or to their expansion, or both.