I think I would add to that, trust. But the point was that I don't think it means we should imagine God like a child does, thinking mythologically, seeing God as threatening to spank us (or send us to hell), for being naughty, or answering prayers like getting a piece of candy from mom and dad for being a good boy or girl. That's childish thinking, imagining God as some parent figure handing our rewards and punishments that we have to please. Becoming that will actually prevent you from seeing the kingdom of God, for many reasons. To become an adult means seeing "face to face", not a childlike perspective.