^11-13 His “gifts to men” were varied. Some he made his messengers, some prophets, some preachers of the Gospel; to some he gave the power to guide and teach his people. His gifts were made that Christians might be properly equipped for their service, that the whole body might be built up until the time comes when, in the unity of the common faith and common knowledge of the Son of God, we arrive at real maturity—that measure of development which is meant by the “fullness of Christ”.

True maturity means growing up “into” Christ

^14-16 We are not meant to remain as children at the mercy of every chance wind of teaching and the jockeying of men who are expert in the craft presentation of lies. But we are meant to hold firmly to the truth in love, and to grow up in every way into Christ, the head. For it is from the head that the whole body, as a harmonious structure knit together by the joints with which it is provided, grows by the proper functioning of individual parts to its full maturity in love.