"The gifts he gave were that some would be apostles, some prophets, some evangelists, some pastors and teachers, to equip the saints for the work of ministry, for building up the body of Christ, until all of us come to the unity of the faith and of the knowledge of the Son of God, to maturity, to the measure of the full stature of Christ. We must no longer be children, tossed to and fro and blown about by every wind of doctrine, by people’s trickery, by their craftiness in deceitful scheming. But speaking the truth in love, we must grow up in every way into him who is the head, into Christ, from whom the whole body, joined and knitted together by every ligament with which it is equipped, as each part is working properly, promotes the body’s growth in building itself up in love" (Ephesians 4:11-16).
You asked specifically about verse 16, but it really doesn't stand alone. It completes the statement that begins with verse 11. Paul is concerned with explaining how people are to live in the wake of the conversion experience that introduced them to Christ Awareness. Each of us is fully the Christ, he writes, and that new understanding provides an anchor of Truth, centering us and keeping us from being "blown about" by the cacophony of voices and opinions that once confused us. Each of us is a unique expression of that eternal Christ, with unique gifts and challenges but one central purpose: the "full stature of Christ" expressing through the choices we make in spiritual consciousness. Just as the "whole body" is a unified expression of many different parts expressing as one, so must "the church"—those who are aware of themselves as the Christ—be diverse in expression and unified in its purpose of making the choices that will create the new consciousness that Jesus calls "the kingdom of heaven."