μηδενί δίκην δικάσῃς πρίν ἀμφοῖν μῦθον ἀκούσῃς → do not give your judgement on anything until you have heard a speech on both sides
experienced: P. and V. ἔμπειρος.
trusty: P. and V. πιστός, βέβαιος.