Aldous Huxley, The Devils of Loudun
(1952; rpt. New York: Carroll & Graf, 1986), p. 259:
The charm of history and its enigmatic lesson consist in the fact that, from age to age, nothing changes and yet everything is completely different. In the personages of other times and alien cultures we recognize our all too human selves and yet are aware, as we do so, that the frame of reference within which we do our living has changed, since their day, out of all recognition, that propositions which seemed axiomatic then are now untenable and that what we regard as the most self-evident postulates could not, at an earlier period, find entrance into even the most boldly speculative mind.