Who would have thought to create whole universes, black holes, or subatomic particles? Who would have thought to create the variety of cells needed to make up the human body? Who could have imagined the multitudes of plants and animals? To create a moon to affect the tides?
Creation shows the profligacy of God. Only He who has everything can afford to be so lavish. His generosity extended to sending his son to live and die for us - even though he only had one. The Psalmist didn't know that God would do that. We do.
What's our response?