Do angels, free of many of our noetic limitations as humans, know more about God by nature than we do? According to St. Thomas, the strength of the angelic intellect in comparison to that of humans lies less in what it knows about God than it does in their much greater clarity and certainty in what it doesn’t know:
Now, separate substances know more things than we do, and things that are closer to God; consequently, in their understanding, they set apart from God more things, and more intimately related things, than we do. So, they approach more closely to a proper knowledge of Him than we do, although even these substances do not see the divine substance by means of their understanding of themselves. (SCG 3.49.10)
As Aquinas succinctly puts it in the following chapter, the angels “know that the divine substances is unknown to them.” The “theology of the angels,” in a word, is an apophatic theology, such that even angels, by their nature, fall short of the beatific vision of God in his essence. For that kind of knowledge, they are no less dependent on grace than we are.