Stobaeus, Florilegium, XL, VI, 24, as reported in Harbottle's Dictionary of Quotations (1897), p. 515.
Agathon von Athen: Zitate auf Englisch
“It is a part of probability that many improbable things will happen.”
Aristotle, Poetics, XXV, quoted by George Eliot in an epigraph to Chapter 41 of Daniel Deronda.
“Even God cannot change the past.”
Aristotle, Nicomachean Ethics, Book VI, sect. 2, 1139b.
Variant translation: Not even the gods can change the past.