μήτε δίκην δικάσῃς πρίν ἀμφοῖν μῦθον ἀκούσῃς → do not give your judgement until you have heard a speech on both sides
eagerly: P. ἐντόνως, συντόνως.
vigorously: P. ἰσχυρῶς, Ar. and P. νεανικῶς; sea vigorously.
attack vehemently: Ar. and P. ἐγκεῖσθαι (dat.), P. πολὺς ἐγκεῖσθαι.