πιστἄ διδόναι

τὸ γὰρ ἐμφυὲς οὔτ' αἴθων ἀλώπηξ οὔτ' ἐρίβρομοι λέοντες διαλλάξαιντο ἦθος → the red fox and the roaring lion cannot change the nature born in them