The Sermon on the Mount is not a social program per se, to be sure. But it is only when the great inspiration it gives us vitally influences our thought and our action, only when faith generates the strength of renunciation and responsibility for our neighbor and for the whole of society--only then can social justice grow, too. And the Church as a whole must never forget that she has to remain recognizably the community of God's poor. Just as the Old Testament opened itself through God's poor to renewal in the New Covenant, so too any renewal of the Church can be set in motion only through those who keep alive in themselves the same resolute humility, the same goodness that is always ready to serve.
--Pope Benedict XVI, Jesus of Nazareth (New York: Doubleday, 2007), p. 77