John F. Macarthur Jr. said this quote
“ Within the church, it is possible for believers to possess a profound unity based on a shared commitment to Biblical truth, an intimate knowledge of the Lord Jesus Christ, and a deep level of spiritual maturity. Paul also adds sound doctrine and growing in Christlikeness as additional benefits that result from the saints being properly equipped to build up the body of Christ.(Comments on Ephesians 4 vs 11-13) ”