1 Corinthians 3:2
I fed you with milk, not solid food, for you were not ready for it.
And even now you are not yet ready...
Normally it's not a good thing to stay childlike. Innocence is seen as naivete, candor is seen as brashness, and the truth can hurt. We graduate from sippy cups to glasses when we learn not to throw our milk around, and diapers get replaced by big-kid undies when we learn personal hygiene.
Yet—hear me out—God wants us to stay children. No, not in the mental sense, because he wants us eating grown-up spiritual food and studying his Word in-depth (1 Corinthians 3:2). What he wants is the full-blown joy and trust and love that only a child has. God wants that Christmas morning feeling to permeate everything and shine the light of his truth and love everywhere!
Think about it. Where else do you see such unabashed, unconstrained honesty and joy? Who else has an infectious desire for life and everything in it?
And where do we get such a childlike demeanor? Jesus!
I've noticed that during children's sermons at church, the most common answer to pretty much any question the kids are asked is, “Jesus,” no matter what the question is. And he kind of is the answer to everything—he is our joy, our salvation, our light, our life, our worry-carrier, and our sin-eraser. Kids are quick to say who their savior is and who loves them and who lives in their hearts.
What happens as we get older? Why do we become more hesitant to be respond to things religion-based? Surely as we mature, the filter on our mouths is doing its job and we're not blurting out whatever comes to mind, not like little kids. Yet... that joy that comes only from a child gets lost at the same time. The quickness of response is gone. I can't tell you how many times I have faltered at giving what I would have considered a good, godly answer to something Satan threw in my path. Something as simple as what I believe, even!
The Holy Spirit gives us the words we need (Luke 12:12) when we need them; you are then “prepared to make a defense to anyone who asks you for a reason for the hope that is in you” (1 Peter 3:15). And how does that happen? Study! Dive in, dig deep, get into the nitty-gritty of what God has to say in the Bible, get familiar with it. It's how he speaks to us and how we learn and imprint upon the mind the words of saving grace.
It's how we keep an answer always on our tongues, ready for us to say excitedly, “Guess what? I'm saved! You can be, too!”
So while we act like normal adults on the outside, we are bursting with a joy on the inside that cannot and should not be contained (Philippians 4:4-5). Just like a little kid! Jesus is my inner child, filling me with the joy of his salvation and an exuberance worthy of a young'n