A.T. Robertson Commentary 1 Corinthians 15:46

"Howbeit that is not first which is spiritual, but that which is natural; then that which is spiritual." — 1 Corinthians 15:46 (ASV)

Howbeit that is not first which is spiritual, but that which is natural (αλλ' ου πρωτον το πνευματικον, αλλα το ψυχικον). Literally, "But not first the spiritual, but the natural." This is the law of growth always.