ὑπὸ δὲ τῆς φιλαυτίας παρηγμένοι ἄλογα φασὶν τὰ ζῷα ἐφεξῆς τὰ ἄλλα σύμπαντα → it is self-love which leads them to say that all the other animals without exception are non-rational
rash: P. προπετής, P. and V. θρασύς.
be petulant, v.: Ar. and P. νεανιεύεσθαι.