God is—and the Christian faith adds: God is as Father, Son, and Holy Spirit, three and one. This is the very heart of Christianity, but it is so often shrouded in a silence born of perplexity. Has the Church perhaps gone one step too far here? Ought we not rather leave something so great and inaccessible as God in his inaccessibility? Can something like the Trinity have any real meaning for us? Well, it is certainly true that the proposition that “God is three and God is one” is and remains the expression of his otherness, which is infinitely greater than we and transcends all our thinking and our existence. But if this proposition had nothing to say to us, it would not have been revealed. And as a matter of fact, it could be clothed in human language only because it had already penetrated human thinking and living to some extent.
Joseph Ratzinger, The God of Jesus Christ: Meditations on the Triune God (trans. Brian McNeil; San Francisco: Ignatius Press, 2008), 29.