prodoceo

prō-dŏcĕo, ēre, v. a.,

to teach before , i. e. to show by teaching , to inculcate (= docere altā voce et palam): haec Janus summus ab imo Prodocet, Hor. Ep. 1, 1, 55 (perh. imitation of the Greek προδιδάσκειν).