Keller on the Trinity

I'm currently preparing for a lecture this Friday at Kings Training College on the topic of the Trinity (I understand; you're trying to suppress the jealousy), and have found Keller's The Reason for God to be particularly helpful, particular his chapter titled 'The Dance of God'.

Many writers on this topic become confusing and difficult to grasp. Keller's writing is logical and practical. Here's a snippet:

Christianity, alone among the world faiths, teaches that God is triune. The doctrine of the Trinity is that God is one being who exists eternally in three persons: Father, Son, and Holy Spirit. The Trinity means that God is, in essence, relational...

If there is no God, then everything in and about us is the product of blind impersonal forces. The experience of love may feel significant, but evolutionary naturalists tell us that it is merely a biochemical state in the brain.

But what if there is a God? Does love fare any better? It depends on who you think God is. If God is unipersonal, then until God created other beings there was no love, since love is something that one person has for another. This means that a unipersonal God was power, sovereignty, and greatness from all eternity, but not love...

However, if God is triune, then loving relationships in community are the "great fountain... at the center of reality."... In the Christian conception, God really has love as his essence...

Ultimate reality is a community of persons who know and love one another. That is what the universe, God, history, and life is all about. If you favor money, power, and accomplishment over human relationships, you will dash yourself on the rocks of reality...

You will never get a sense of self by...making everything revolve around your needs and interests. Unless you are willing to experience the loss of options and the individual limitation that comes from being in committed relationships, you will remain out of touch with your own nature and the nature of things.

Needless to say, the whole chapter is a brilliant yet easily understood explanation of the Trinity.