Eph 4:10-15
10 He that descended is the same also that ascended up far above all heavens, that he might fill all things.)
11 And he gave some, apostles; and some, prophets; and some, evangelists; and some, pastors and teachers;
12 For the perfecting of the saints, for the work of the ministry, for the edifying of the body of Christ:
13 Till we all come in the unity of the faith, and of the knowledge of the Son of God, unto a perfect man, unto the measure of the stature of the fulness of Christ:
14 That we henceforth be no more children, tossed to and fro, and carried about with every wind of doctrine, by the sleight of men, and cunning craftiness, whereby they lie in wait to deceive;
15 But speaking the truth in love, may grow up into him in all things, which is the head, even Christ:
If you look in verse 11 you will see the purpose of those that God has given to the church, with the intent and result to perfect (mature) the saints and edify (build up) the body of Christ, till we all come to the unity of the faith and the knowledge of the Son of God ... and be no more children tossed to and fro by every wind of doctrine ... that we may grow up into Him in all things, which is the head, even Christ.
The problem is that many believers in this present age refuse to put themselves under those that God has given to the church and body of Christ. They are a member of Christ's body but are not functioning as one through the unity of the Spirit and never are able to come into the unity of the faith. They are always challenging those that God has given to the church with their own understanding and do not humble themselves to receive from those that God has given to preach and teach the word and doctrine. They commend themselves and compare themselves with those that God has given, which is not wise / 2Cor 10:12. There have been some that have come to this site and have done this and been critical of those that God has raised up for the church and instead of becoming wise they became fools.
The unity of the faith we grow into, which is given to edify the body of Christ, points to sound doctrine and the supply of the Spirit / Phil 1:19 to reveal Christ as the head. Without this unity of the faith we have no fellowship with Christ as our head and our relationship to the members of His body is cut off from the supply that comes from every joint / Eph 4:16. We are independent believers who are saved but never become an active participant in a living organism that was redeemed and regenerated as the one new man, who is born of the Spirit and the water of God's word and incorruptible seed to function as one body / Eph 5:26, Titus 3:5, 1Pt 1:23.
Read Psalm 133 as it relate to this kind of unity.