'Nonspiritual' in the Bible

But the natural [unbelieving] man does not accept the things [the teachings and revelations] of the Spirit of God, for they are foolishness [absurd and illogical] to him; and he is incapable of understanding them, because they are spiritually discerned and appreciated, [and he is unqualified to judge spiritual matters].

However, brothers and sisters, I could not talk to you as to spiritual people, but [only] as to worldly people [dominated by human nature], mere infants [in the new life] in Christ!