God uses his strength and skill to bring wonderful things into existence, like the earth and heavens.
the work of the Glory-Father, when he of wonders of every one, eternal Lord, the beginning established (3-4)
Single-handedly God invented every wonder of the universe. "Wonder" in particular emphasizes the ingenuity behind this spiritual act of creation, as if God is also something of a magician as well as, you know, God himself.
He first created for men's sons heaven as a roof (5-6)
A roof isn't as cool as "wonders," but it still speaks well of those "mind-plans."