“Even a god cannot change the past”

Agathon, quoted in Aristotle’s Nicomachean Ethics Book VI, sect. 2, 1139b

Literally translated from the Greek, this reads, “… the one thing that even God cannot do is to make undone that which has been done”. The idea engenders debate among theists: if God is absolute and can change anything he likes, how can it make sense to limit his omnipotence?

Events occur according to probabilistic natural laws and these are dictated by time’s arrow which flies in one direction only. Logicians point out that therefore the past cannot be changed without…