Thematic Bible: Who is immature

Brothers, I couldn't speak to you as to spiritual, but as to fleshly, as to babies in Christ. I fed you with milk, not with meat; for you weren't yet ready. Indeed, not even now are you ready, for you are still fleshly. For insofar as there is jealousy, strife, and factions among you, aren't you fleshly, and don't you walk in the ways of men?

About him we have many words to say, and hard to interpret, seeing you have become dull of hearing. For although by this time you should be teachers, you again need to have someone teach you the rudiments of the first principles of the oracles of God. You have come to need milk, and not solid food. For everyone who lives on milk is not experienced in the word of righteousness, for he is a baby.