Today we celebrate the Trinity, or more correct in my view; the Godhead. 3 persons in One God.
We see a clear relation of their manifestation in Genesis 1. The Spirit hovers over the waters, the voice we hear is the Son over creation. The “Let us” statements could be the Father speaking.
For a interesting study we could examine the times the Father speaks. One such time we find in Psalm 110:1. The Father invites the Son to sit at His Right Hand. This is for a determined purpose; to wrap up this creation and bring in the fulness of Kingdom. It is interesting that David catches this dialogue prophetically.
In the Gospels we read of Jesus praying.
Father, glorify thy name. Then came there a voice from heaven, saying, I have both glorified it, and will glorify it again.
John 12:28 KJV
The hearers heard it as thunder, but they had a sense that something happened. In this chapter Jesus shows how judgment had been conferred in the Son to carry out.
In Peter’s preach we read in Acts 2 about what the Son asks of the Father. He asks Him to send the Holy Spirit. So when the Bible shows us God, it shows us the manifestation of 3 people in one God.
We have something very interesting to see when it comes to celebrating this day in the Church calendar. We see the Son proceeding from the Father and the Spirit proceeding from the Son. John 14 says the Spirit is sent to us to take what is of the Son and make it ours. So the Spirit in us manifests in us the Godhead in its sanctifying work, readying us for conforming to the image of the Son, and for our “eternal estate”. Our interaction with the Godhead is relational because the Father sent the Son to die for us, and the Son sent the Spirit to bring us new birth and life in His Image.
It is a motive for celebration.