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Eph 1:3-14 in the original greek is one sentence. It is a praising to the one God by speaking of the Father in verses 3-6, the Son 7-12 and Holy Spirit 13-14.

There's also the formula and command in Mt 28:19 to baptize in the name (singular) of THE Father and THE Son and THE Holy Spirit.

One can also go to Mt 3:16-17 where the Lord's baptism is depicted. The Son is there, being baptized, the Spirit ascending and the Father speaking.

In Joh 17:5 Jesus is praying to the Father to glorify him with the glory he had in his presence bevor the world existed.

That the Spirit is neither the Father nor the Son is evident from Joh 16:13-15. He is nevertheless God according to Acts 5:3-4.

The biblical doctrine of the Trinity entails three simple truths:

  1. There is only one (being of) God.
  2. There are three distinguishable Persons who are the one God (or are sharing the one being of God).
  3. These three Persons are co-eternal and co-equal but distinct in their roles.

Interesting approach on Eph 1:3-14. Thanks for taking the time.