μηδενί δίκην δικάσῃς πρίν ἀμφοῖν μῦθον ἀκούσῃς → do not give your judgement on anything until you have heard a speech on both sides
P. and V. ὑβριστής, ὁ, V. γελαστής, ὁ, ἐγγελαστής, ὁ.