I love these opening lines from Hauerwas' sermon, "Naming God," which comes from Working with Words.
"'God is whoever raised Jesus from the dead, having before raised Israel from Egypt' is the hallmark sentence of Robert Jenson's Systematic Theology. This elegantly simple but dauntingly deep sentence took Jenson a lifetime of theological reflection to write. To write such a sentence requires that the grammar of our faith discipline our presumption that we know what we say when we say 'God.' For it turns out that we are most likely to take God's name in vain when we assume we can know what we say when we say 'God'" (79).