At that time Jesus, full of joy through the Holy Spirit, said, "I praise you, Father, Lord of heaven and earth, because you have hidden these things from the wise and learned, and revealed them to little children. Yes, Father, for this was your good pleasure.

-- Luke 10:21

And he said: "I tell you the truth, unless you change and become like little children, you will never enter the kingdom of heaven.

-- Matthew 18:3

If you then, though you are evil, know how to give good gifts to your children, how much more will your Father in heaven give the Holy Spirit to those who ask him!"

-- Luke 11:13