Something when he is nothing (ti mēden ōn). Thinks he is a big number being nothing at all (neuter singular pronouns). He is really zero.
He deceiveth himself (phrenapatāi heauton). Late compound word (phrēn, mind, apataō, lead astray), leads his own mind astray. Here for first time. Afterwards in Galen, ecclesiastical and Byzantine writers. He deceives no one else.