In Ephesians 4, Paul says that the body of Christ is built by unity and love.
Paul considered himself a 'prisoner' for the Lord, destined to spread God's Word of love for the rest of his days. He urged the people to present themselves worthy of their calling to Christ. They should be humble, gentle, have patience, love one another, and eager to maintain the unity of the Holy Spirit in the bonds of peace.
Paul did not teach a tiny, little elect that should separate themselves from false Christians. He said there is one body of Christ. There is one Spirit. There was one hope that drew us nearer to Christ. There was only one baptism needed when Paul said, "One Lord, one faith, one baptism." Only one God who was the Father of all mankind, and that Heavenly Father reigned over all mankind through all within all.
Grace was given to all Christians according to the measure of Christ's gift. As the scriptures said, "He ascended on high and led a host of captives, and He gave gifts to men."
Paul said that God also descended into the lower regions, the earth. Christ that descended is the One who also ascended far above the heavens that he might fulfill all things!
Christ did not only give the priests and the prophets power to work. He gave the apostles, prophets, evangelists, shepherds, and teachers for us to equip us! Christ sent them so that we could also do the work of ministry, together building up the body of Christ! And we should do so until we have unity of the faith and the knowledge of the Son of God, Jesus Christ!
Paul warned that we should not act like children, tossed to and fro like the waves of the sea. We should not be carried about by human cunning in their doctrines. We should not be deceived by their schemes. Instead, we should speak Truth and Love! We should grow up in every way to Him that is the Head, into Christ!
Christ is He who makes the entire body whole, joined and held together through every joint. Once each part of the body of Christ is joined together, it begins to work properly. The body then begins to grow so that it builds itself together! And it is joined together by love!
As Christians, we should ask ourselves: Do we have love for our other Christian brothers and sisters? Do we falsely assume that or little church is the only church in the body of Christ? Have we separated one of the joints of the body? Are we equipped to teach of Jesus Christ, or are we teaching some other doctrine? Are we acting like children, as Paul said tossed by the doctrines of men? Are we speaking Truth and Love?