ἡ γὰρ συνήθεια δεινὴ τοῖς κατὰ μικρὸν ἐνοικειουμένοις πάθεσι πόρρω προαγαγεῖν τὸν ἄνθρωπον → for habituation has a strange power to lead men onward by a gradual familiarization of the feelings
strongly: P. ἰσχυρῶς, Ar. also P. ἐρρωμένως.
greatly: P. and V. μέγα, μεγάλα, σφόδρα, κάρτα (Plato but rare P.); see greatly.
intensely: P. συντόνως, ἰσχυρῶς.