Ephesians 4:21

"If indeed" (NASB) means "surely" (NIV, cf. Ephesians 3:2). The Ephesian believers had received teaching about Christ and had learned to live in the sphere of His will. This is the truth in Jesus that is in view. Whenever Paul used the name of Jesus in Ephesians, as here, he drew attention to the death and resurrection of the Savior. He did so here to remind his readers of the essence of the gospel message as an incentive to live for Christ.