It is impossible for us to fully comprehend the Trinity. We know the doctrine, and we all have our own devices to help us explain it. I like to think of a three leaf clover. Yet, none of us quite understand how the one and only God is three persons, the Father, the Son, and the Holy Spirit. Consequently, I think most of us tend to think of each person of God as a total separate being.
How else can we conceive of such a concept. Considering the Trinity is like considering a new color. That is impossible. The best we can do is come up with variations using mixtures of existing colors.
In this single passage of John 14:25-28, Jesus ties Himself, the Holy Spirit, and God into the concept of overcoming fear. Because the Holy Spirit is to arrive… and because Jesus is returning to the Father, who is greater, we are not to fear.
So, it is the person of the Holy Spirit who lives within our hearts, teaching us, speaking to us, helping us to pray. It is Jesus who sits beside the Father, acting as our advocate. It is the Father who sits upon the throne. Yet, all three are one. Got it. Sort of.
Best I can.
I understand it…
… Like I understand a new color.
Let me go back to the clover: three leafs, one clover.
I may not understand, but I will not fear, for Christ returns to the Father, who is greater, and has sent us the Holy Spirit.
Holy, holy, holy
Though the darkness hide Thee
Though the eyes of sinful man Thy glory may not see
Lord, only Thou art holy and there is none beside Thee
Perfect in power, in love and purity
– Holy, Holy, Holy
Reginald Heber and John Bacchus Dykes, 1861