Most people seem to agree that we cannot and do not want to go back to the
past, but the reason given is often wrong; that time has moved on and what
was can never be again. The truth is that we cannot go back to what we never
left. Our home is the earth, our time the Pleistocene Ice Ages. The past is
the formula for our being.

Paul Shepard, The Tender Carnivore and the Sacred Game