Answer:
If God exercises power with perfect love and understanding, far from corrupting him, it glorifies him. “Power corrupts” is often true of mortal beings, but no one has more power than parents over children, yet most of us use that power with love and whatever wisdom we can acquire. Such parents are not corrupted at all by the power of parenthood, and, to borrow a phrase, “generations will rise up and call them blessed.” (Imagine that said by Cary Grant in The Bishop's Wife.)
So we, in our imperfection, at no time approach the goodness of God more closely than when we are wise, kind, generous and instructive parents. And he never more completely expresses his relation to us than when we see him as our Father.