I know how great is the effort needed to convince the proud of the power and excellence of humility, an excellence which makes it soar above the summits of this world, which sway in their temporal instability, overtopping them all with an eminence not arrogated by human pride, but granted by divine grace.
Augustine of Hippo, The City of God (426), H. Bettenson, trans. (1972), p. 5