"In one sense the doctrine of the Trinity is our admission--as beings created and finite, fallen and flawed--that we simply cannot fully grasp all that God is... ...The doctrine of the Trinity represents a chastened admission that we are unable to master God."
"The doctrine of the Trinity gathers together the richness of the complex Christian understanding of God; it yields a vision of God to which the only appropriate response is adoration and devotion. The doctrine knits together into a coherent whole the Christian doctrines of creation, redemption, and sanctification. By doing so, it sets before us a vision of God who created the world, whose glory can be seen reflected in the wonders of the natural order; a God who redeemed the world, whose love can be seen in the tender face of Christ; and a God who is present now in the lives of believers."
(Allister E. McGrath; "The Doctrine of the Trinity: An Evangelical Reflection"; God the Holy Trinity: Reflections on Christian Faith and Practice; Timothy George, Editor; (Baker Academic, 2006)