Even Nature, used to existences extending through millions of years, is itself subject to this ever-changing process. What chance then is there for the creations of man? How could they hope to endure? We may think of the Sphinx and the Pyramid as likely to outlast the hours--but stay! look at their neighbour, Sahara: today a vast sea of sand, but formerly a vast sea of water. So we must conclude that all is perishable--yet, to complete the picture, we must admit also that all is renewable.
-- Notebooks Category 26: World-Idea > Chapter 2: Change As Universal Activity > # 8