Matthew 18:1-6

1  At that time the disciples approached Jesus and said, "Who is the
greatest in the kingdom of heaven?"  2 He called a child over, placed
it in their midst, 3 and said, "Amen, I say to you, unless you turn
and become like children, you will not enter the kingdom of heaven. 4 Whoever humbles himself like this child is the greatest in the
kingdom of heaven. 5  And whoever receives one child such as this in
my name receives me. 6  Whoever causes one of these little ones who
believe in me to sin, it would be better for him to have a great
millstone hung around his neck and to be drowned in the depths of the
sea.