κρῖναι δὲ λόγῳ πολύδηριν ἔλεγχον ἐξ ἐμέθεν ῥηθέντα → judge by reason the too much contested argument which has been given by me
P. and V. πείθειν, ἀναπείθειν (Euripides, Helen 825), V. ἔκπείθειν.
be convinced, be sure: see under sure.