Note 5 at Ac 7:22: The Egyptians were the most advanced civilization in the world during the time of Moses. For Moses to be "learned in all the wisdom of the Egyptians" that means he certainly was no dummy, as he claimed to be when trying to dodge God's call (Ex 4:10). Josephus, who wrote in the first century a history of the Jewish people, said that Moses was general of the Egyptian army and defeated the invading Ethiopian army (The Antiquities of the Jews, Book 2, Chapter 10).

Note 6 at Ac 7:22: This is in sharp contrast with what Moses said in Ex 4:10. It must be that Stephen, under the inspiration of the Holy Spirit, spoke the truth and that Moses simply lied to God in an attempt to excuse himself from service.