Jamieson, Fausset and Brown on Ephesians 4:13

13. come in--rather, "attain unto." Alford expresses the Greek order, "Until we arrive all of us at the unity," &c.

faith and ... knowledge--Full unity of faith is then found, when all alike thoroughly know Christ, the object of faith, and that in His highest dignity as "the Son of God" [De Wette] (Ep 3:17, 19; 2Pe 1:5). Not even Paul counted himself to have fully "attained" (Php 3:12-14). Amidst the variety of the gifts and the multitude of the Church's members, its "faith" is to be ONE: as contrasted with the state of "children carried about with EVERY WIND OF DOCTRINE." (Ep 4:14).

perfect man--unto the full-grown man (1Co 2:6; Php 3:15; He 5:14); the maturity of an adult; contrasted with children (Ep 4:14). Not "perfect men"; for the many members constitute but one Church joined to the one Christ.

stature, &c.--The standard of spiritual "stature" is "the fulness of Christ," that is, which Christ has (Ep 1:23; 3:19; compare Ga 4:19); that the body should be worthy of the Head, the perfect Christ.