I would like to also add one detail I had missed. Notice the coordinating conjunction ἵνα (That [henceforth]) denotes a result.
Strong's Definition
Probably from the same as the former part of G1438 (through the demonstrative idea; compare G3588); in order that (denoting the purpose or the result): - albeit because to the intent (that) lest so as (so) that (for) to. Compare G3363 .
What is the cause of this result? Our arrival or coming in the unity of faith. See the preceding verse.
Ephesians 4:13 KJVS
Till we all come in the unity of the faith, and of the knowledge of the Son of God, unto a perfect man, unto the measure of the stature of the fulness of Christ:
John 6:44 KJVS
No man can come to me, except the Father which hath sent me draw him: and I will raise him up at the last day.