[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)