Faith gives life to the soul; and they be as much dead to God who lack faith, as they be to the world whose bodies lack souls. Without faith all that we do is but dead before God, although the work seems ever so gay and glorious before man. Even as a picture graven or painted is but a dead representation of the thing itself, and is without life or any manner of moving; so  be the works of all unfaithful persons before God.

—Homily of Good Works