Albert Barnes on 1 Corinthians 15:46

Howbeit. There is a due order observed, 1Cor 15:23. The decaying, the dying, the weak, the corruptible, in the proper order of events, was first. This order was necessary, and this is observed everywhere. It is seen in the grain that dies in the ground, and in the resurrection of man. The imperfect is succeeded by the perfect; the impure by the pure; the vile and degraded by the precious and the glorious. The idea is, that there is a tendency towards perfection, and that God observes the proper order by which that which is most glorious shall be secured. It was not his plan that all things in the beginning should be perfect; but that perfection should be the work of time, and should be secured in an appropriate order of events. The design of Paul in this verse seems to be to vindicate the statement which he had made, by showing that it was in accordance with what was everywhere observed, that the proper order should be maintained. This idea is carried through the following verses.

(*) "Howbeit" "However" (+) "natural" "Animal"