Even god is deprived of this one thing:
To render undone whatever has been done.
μόνου γὰρ αὐτοῦ καὶ θεὸς στερίσκεται,
ἀγένητα ποιεῖν ἅσσ’ ἂν ᾖ πεπραγμένα
Agathon, tragic poet, guest-star in Platonic dialogues and a play by Aristophanes, may not have known he was an early formulator of a time-travel paradox…