Plato, Laws 797e

ψυχῶν, ἐν ὡς ἔπος εἰπεῖν οὐ τοῖς μέν, τοῖς δʼ οὔ, πλήν, ὅτιπερ εἶπον νυνδή, κακοῖς· ὥστε, εἴ τις ἀποβλέψειε πρὸς σώματα, ὡς πᾶσι μὲν σιτίοις, πᾶσι δʼ αὖ ποτοῖς καὶ πόνοις συνήθη γιγνόμενα, καὶ τὸ πρῶτον ταραχθέντα ὑπʼ αὐτῶν, ἔπειτʼ ἐξ αὐτῶν τούτων ὑπὸ χρόνου σάρκας φύσαντα οἰκείας

Accordingly, if one considers the human body, and sees how it grows used to all kinds of meats and drinks and exercises, even though at first upset by them, and how presently out of these very materials it grows flesh that is akin to them, and acquiring thus a familiar acquaintance with,