The doctrine of the Trinity affirms that it belongs to God's very nature to be committed to human beings and our history, that God's covenant with us is irrevocable, that God's face is immutably turned toward us in love, that God's presence is to us utterly reliable and constant. Christian life is an expression of mutuality, reciprocity and equality. These realities are at the heart of the Trinitarian doctrine. This is more than having mutual funds in the stock market. It is a mutuality in which we share decisions on where to go for vacation, whether or not to move across country, when and where we will work with the poor.
Mutuality is a sharing of our lives, a sense of deep solidarity.
The Gospel tells us that God is with us always, just as Jesus was with the Father and in the Spirit. It is never a one-way street. When we make no return we diminish our humanity. Within the life of the Trinity there is constant interdependence and sharing. We, made to the image and likeness of God, achieve our humanity by embracing and living the notion of reciprocity.