Trinity is One God in three persons and three persons in One God.  For many, this is a big puzzle.  And they soon give up on the puzzle thinking that Trinity is beyond them and not much use to them in real life.  So they soon depart from it and consider something more useful instead.  

However, looking at Jesus, in the gospel story, we see Trinity differently.  For by the Spirit, Jesus opens to us the beauty of God as Triune Communion.  Through him, we do not see God, not as one distinct, self-contained individual that we call GOD.  No!  The God we meet in Jesus is the communion of three persons mutually indwelling one another in self-giving love towards one another. 

Jesus points us to what God has always been and always will be.  There has always been within God a movement of personal relationship and the giving and receiving of love between three persons.  The three are always towards one another and for one another in mutual self-giving.  Looking at Jesus, we see the Oneness of God as the most intimate, the most loving and most profound triune communion.

We do not possess anything in human life that enables us to understand this communal being.  It is unique.  Nevertheless, our faith seeks understanding.  And we gain understanding only as we look at Jesus in the gospel story.  In him, we see the inner relations of God as the communion of love that is personal, dynamic and relational.