ἐὰν ᾖς φιλομαθής, ἔσει πολυμαθής → if you are studious, you will become learned
Use copper, iron, silver, gold, etc.
metals: P. μεταλλεῖα, τά (Plato, Leges 678D; cf., Plato, critias, 114E).
molten metal: V. μύδρος, ὁ.
