Eph 4:4-6
"There is one body and one Spirit—just as you were called to the one hope that belongs to your call— one Lord, one faith, one baptism, one God and Father of all, who is over all and through all and in all."
The creed of Christian unity: 7 'ones' — body, Spirit, hope, Lord, faith, baptism, God. Unity is not uniformity — it is diversity of gifts (4:11-12) serving the same body. The ministerial gifts (apostles, prophets, evangelists, pastors-teachers) are to equip the saints for ministry.
Eph 4:15-16
"Rather, speaking the truth in love, we are to grow up in every way into him who is the head, into Christ, from whom the whole body, joined and held together by every joint with which it is equipped, when each part is working properly, makes the body grow so that it builds itself up in love."
The growth of the Church is organic: each member contributes (kata meran energeian) to the growth of the body. The head is Christ — growth is toward him.