Bede

And I, strengthened by the hand of the Lord my God, etc. He calls the hand of God the power of God, which works all things. Rightly does he gather those whom he will lead from Babylon to Jerusalem, who themselves are known to have the hand of God, by which they are strengthened. Because indeed, thus anyone becomes fit to bring others to God through his teaching, while first he himself is inwardly strengthened in his mind by God's grace against all things that impede the holy work.

Commentary on Ezra and Nehemiah ↗