τὴν οἴησιν ἔλεγε προκοπῆς ἐγκοπήν → he used to say, Opinion forming is the stoppage of progress
perfectē: adv., v. perficio,I P. a. fin.
perfectē,¹³ complètement, parfaitement : Cic. Br. 282 ; Div. 1, 23 ; Fin. 4, 18