'Spiritually' in the Bible

Yet we do speak wisdom among those spiritually mature [believers who have teachable hearts and a greater understanding]; but [it is a higher] wisdom not [the wisdom] of this present age nor of the rulers and leaders of this age, who are passing away;

But the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned.

For this reason I have sent Timothy to you. Spiritually he is my dearly-loved and faithful child. He will remind you of my habits as a Christian teacher--the manner in which I teach everywhere in every Church.