Aristotle, Metaphysics, Book 1 216:

λέγω δ’ οἱο͂ν, εἰ ἔστιν ὁ Καλλίασ λόγοσ ἐν ἀριθμοῖσ πυρὸσ καὶ γῆσ καὶ ὕδατοσ καὶ ἀέροσ, καὶ ἄλλων τινῶν ὑποκειμένων ἔσται καὶ ἡ ἰδέα ἀριθμόσ· καὶ αὐτοάνθρωποσ, εἴτ’ ἀριθμόσ τισ ὢν εἴτε μή, ὅμωσ ἔσται λόγοσ ἐν ἀριθμοῖσ τινῶν καὶ οὐκ ἀριθμόσ, οὐδ’ ἔσται τισ διὰ ταῦτα ἀριθμόσ. ἔτι ἐκ πολλῶν ἀριθμῶν εἷσ ἀριθμὸσ γίγνεται, ἐξ εἰδῶν δὲ ἓν εἶδοσ πῶσ;