Was instructed (epaideuthē). First aorist passive indicative of paideuō, to train a child (pais), the usual idea in ancient Greek as here. The notion of chastisement (Heb 12:6) is also in the old Greek and especially in the lxx and the N.T. Here with instrumental case (pasēi sophiāi) or the locative. The accusative would usually be retained after this verb. The priestly caste in Egypt was noted for their knowledge of science, astronomy, medicine, and mathematics. This reputation was proverbial (1Ki 4:30). Modern discoveries have thrown much light on the ancient civilization of Egypt. Moses, like Paul, was a man of the schools.
Mighty in his words and works (dunatos en logois kai ergois autou). The same phrase used of Jesus in Luk 24:19. The adjective dunatos is employed of Apollos as an interpreter of the Scriptures (Act 18:24). Moses did not have the rhetorical skill or eloquence of Aaron (Exo 4:10), but his words like his deeds carried weight and power.