St. Gregory the Great on the Scriptures:As the word of God exercises the wise by the mysteries it contains, so quite frequently it nourishes plain folk by its surface-meaning. It presents openly the food it offers the little ones; it keeps hidden what will hold people of loftier reach in suspense of admiration. It is, if I may put it this way, a kind of river that is both shallow and deep, in which a lamb may wade and and an elephant may swim. (Gregory, Morals on Job, Preface, iv; PL 75, 515)