Ephesians 4:12-13

12[and He did this] to fully equip and perfect the saints (God’s people) for works of service, to build up the body of Christ [the church];

13until we all reach oneness in the faith and in the knowledge of the Son of God, [growing spiritually] to become a mature believer, reaching to the measure of the fullness of Christ [manifesting His spiritual completeness and exercising our spiritual gifts in unity].