Cosmas Indicopleustes — on Rom 8:20 (The Christian Topography, Book 2)

“Wherefore the angels did not desist from the ministrations which they rendered to men liable to death and corruption, for the Apostle speaks thus: For the creation was subjected to vanity, not of its own will, that is, they were unwilling to labour and serve to no purpose; but, he goes on to say, by reason of him who subjected it in hope. In what hope? Because, as is quite evident, after the transgression the angels, when they saw that God was not carrying into effect the sentence upon man, but treating him with loving care and providing him with clothing, came to entertain better hopes of man, so that they did not despair of him but ministered in his behalf”