Agathon, fr. 5

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…

Zeno (Aristotle, Metaphysics, Β 4.1001 b7)

 

 

[Zeno said that] “That which does not make something bigger or smaller when it is added or taken away is not real.”

 

ὃ γὰρ  µήτε προστιθέµενον µήτε ἀφαιρούµενον ποιεῖ µεῖζον

µηδὲ ἔλαττον, οὔ φησιν εἶναι τοῦτο τῶν ὄντων

 

From Zeno of Elea, a student of Parmenides.  Famous for paradoxes (he even appears as an interlocutor for Socrates in Plato’s Parmenides).

(Not the Zeno who founded Stoicism)