As Father Son and Spirit move together in the world, we see that the divine persons are so tightly bound up together that we cannot think of one person apart from the others.  Indeed, their relationships with one another make them who they are as persons. 

It follows from this that human persons are also defined similarly by their relationships with one another. God created us to be relational to the point that being relational makes us persons.  However, our relationships with others are now seriously depersonalised. But through Jesus and the Spirit, God’s relations with us and our relations with God are deeply personalised.  And so, T. F Torrance speaks of Jesus as the personalising person, who restores us as persons in relation to other persons. 

As God personalises us in Jesus and the Spirit we come to know something of God as the communion of Father, Son and Spirit within their inner life.  We cannot begin to understand this by merely studying the doctrine of the Trinity.  Only as personalised persons sharing in the communion of love can we begin to see who the Triune God is.  

When Eugene Peterson began to see the Trinity as an emphatic statement that God is relational he moved into a new life of praying as relational and serving as relational.  I suppose that was because he was in the process of being personalised. He was personalised by the Person of the Son who lives as a dearly loved Son in a relationship with his Father in the communion of the Spirit.  And who also lives in us as a personalising person restoring all our relationships in the Spirit.