From the Protrepticus, or Address to the Heathen, ch. 4:
Human art, moreover, produces houses, and ships, and cities, and pictures. But how shall I tell what God makes? Behold the whole universe; it is His work: and the heaven, and the sun, and angels, and men, are the works of His fingers. How great is the power of God! His bare volition was the creation of the universe. For God alone made it, because He alone is truly God. By the bare exercise of volition He creates; His mere willing was followed by the springing into being of what He willed.
Relevant to my recent post, wouldn’t you say?