/summa/FP/FPII/FP_Q7:
After considering the divine perfection we must consider the divine infinity, and God's existence in things: for God is everywhere, and in all things, inasmuch as He is boundless and infinite.
Concerning the first, there are four points of inquiry:
(1) Whether God is infinite?
(2) Whether anything besides Him is infinite in essence?
(3) Whether anything can be infinitude in magnitude?
(4) Whether an infinite multitude can exist?