1Ⅱ As believers in Christ and as members of the Body of Christ, we are “being built upon the foundation of the apostles and prophets, Christ Jesus Himself being the cornerstone”—v. 20:
2A Since the mystery of Christ, the church, has been revealed to the apostles, the revelation that they received is considered the foundation upon which the church is built—3:4-5; 2:20:
31 This corresponds to the rock in Matthew 16:18, which is not only Christ Himself but also the revelation concerning Christ, on which He will build His church.
103 In God’s New Testament economy Christ as the cornerstone, in His saving us (Acts 4:10-12), first makes us living stones for the building up of God’s spiritual house (Matt. 16:18; John 1:42; 1 Pet. 2:4-7) and then, in the process of His transforming us (Rom. 12:2a; 2 Cor. 3:18), builds us up into a dwelling place of God (Eph. 2:19-22) so that He may carry out God’s eternal economy for God’s good pleasure (1:9; 3:9-11).