Matthew 18:2-4

2 For an answer Jesus called over a child, whom he stood in the middle of the room,

3 and said, "I'm telling you, once and for all, that unless you return to square one and start over like children, you're not even going to get a look at the kingdom, let alone get in.

4 Whoever becomes simple and elemental again, like this child, will rank high in God's kingdom.