Whether a beatified angel can sin?

❌ Objection 1 : It would seem that a beatified angel can sin. For, as was said above (Article [7]), beatitude does not do away with nature. But it is of the very notion of created nature, that it can fail. Therefore a beatified angel can sin.

❌ Objection 2 : Further, the rational powers are referred to opposites, as the Philosopher observes (Metaph. iv, text. 3). But the will of the angel in beatitude does not cease to be rational. Therefore it is inclined towards good and evil.

❌ Objection 3 : Further, it belongs to the liberty of free-will for man to be able to choose good or evil. But the freedom of will is not lessened in the beatified angels. Therefore they can sin.