Albert Barnes Commentary Acts 7:22

"And Moses was instructed in all the wisdom of the Egyptians; and he was mighty in his words and works." — Acts 7:22 (ASV)

Moses was learned. Or, was instructed. This does not mean that he had that learning, but that he was carefully trained or educated in that wisdom. The passage does not state that Moses was distinguished for learning, but that he was carefully educated, or that pains were taken to make him learned.

Regarding the phrase in all the wisdom of the Egyptians: The learning of the Egyptians was primarily confined to astrology, the interpretation of dreams, medicine, mathematics, and their sacred science or traditional doctrines about religion, which were concealed chiefly under their hieroglyphics.

Their learning is often spoken of in the Scriptures (1 Kings 4:30). Their knowledge was also celebrated in the pagan world. It is known that science was carried from Egypt to Phoenicia, and from there to Greece; indeed, quite a few Greek philosophers traveled to Egypt in pursuit of knowledge.

And was mighty. That is, he was powerful or distinguished. This means that he was eminent in Egypt before he led the children of Israel out. It refers to his addresses to Pharaoh and to the miracles he performed before their departure.

In words. From Exodus 4:10, it seems that Moses was slow of speech, and of a slow tongue. When it is said that he was mighty in words, it means that he was mighty in his communications to Pharaoh, even though they were spoken by his brother Aaron. Aaron acted as his spokesman, and Moses addressed Pharaoh through him, as Aaron was appointed to deliver the message (Exodus 4:11–16).

Deeds. This refers to miracles (Exodus 7 and following).

Note: The term "learned" may also be rendered "instructed." For the phrase mighty in words, compare Luke 24:19.