Gregory of Nyssa · The Great Catechism
Chapter XXVI — A certain deception was indeed practised upon the Evil
--A certain deception was indeed practised upon the Evil one, by concealing the Divine nature within the human; but for the latter, as himself a deceiver, it was only a just recompense that he should be deceived himself: the great adversary must himself at last find that what has been done is just and salutary, when he also shall experience the benefit of the Incarnation. He, as well as humanity, will be purged.
Chapters XXVII., XXVIII.--A patient, to be healed, must be touched; and humanity had to be touched by Christ. It was not in "heaven"; so only through the Incarnation could it be healed.--It was, besides, no more inconsistent with His Divinity to assume a human than a "heavenly" body; all created beings are on a level beneath Deity. Even "abundant honour" is due to the instruments of human birth.
Chapters XXIX., XXX., XXXI.--As to the delay of the Incarnation, it was necessary that human degeneracy should have reached the lowest point, before the work of salvation could enter in. That, however, grace through faith has not come to all must be laid to the account of human freedom; if God were to break down our opposition by violent means, the praise-worthiness of human conduct would be destroyed.