μηδενί δίκην δικάσῃς πρίν ἀμφοῖν μῦθον ἀκούσῃς → do not give your judgement on anything until you have heard a speech on both sides
mĕdĭāle, is, n. (medius), le milieu, le cœur [d’un arbre] : Sol. 20, 9 ; 52, 53.