'Little Children' in the Bible

"To what can I compare the people living today? They're like little children who sit in the marketplaces and shout to each other,

Then he said, "I tell all of you with certainty, unless you change and become like little children, you will never get into the kingdom from heaven.

Then some little children were brought to him so that he might lay his hands on them and pray. But the disciples rebuked those who brought them.

Jesus, however, said, "Let the little children come to me, and stop keeping them away, because the kingdom from heaven belongs to people like these."