Gregory the Great — on 1Pet 1:12 (Morals on the Book of Job, Book 18, Section 91)

“But because it is said concerning God by the first preacher of the Church, Whom the Angels desire to look upon, there are some who imagine that even the Angels never see God; and yet we know that it is spoken by a sentence of Truth, In heaven their Angels do always behold the face of My Father, Which is in heaven. Does, then, Truth sound one thing and the preacher of truth another? But if both sentences be compared together, it is ascertained, that they are not at all at variance with one another. For the Angels at once see and desire to see God, and thirst to behold and do behold. For if they so desire to see Him that they never at all enjoy the carrying out of their desire, desire has anxiety without fruit, and anxiety has punishment. But the blessed Angels are far removed from all punishment of anxiety, because never can punishment and blessedness meet in one. Again, when we say that these Angels are satisfied with the vision of God, because the Psalmist too says, I shall be satisfied when I awake with Thy likeness, we are to consider that upon satisfying there follows disgust. So then, that the two may rightly agree together, let Truth say, that they always see; and let the excellent Preacher say, that they always desire to see. For that there be not anxiety in desire, in desiring they are satisfied, and that there be not disgust in their satisfying, whilst being satisfied they desire. And therefore they desire without suffering, because desire is accompanied by satisfying. And they are satisfied without disgust, because the very satisfying itself is ever being inflamed by desire.”