Matthew 18: 1 - 5, 10, 12 - 14
1 At that time the disciples came to Jesus, saying, "Who is the greatest in the kingdom of heaven?"
2 And calling to him a child, he put him in the midst of them,
3 and said, "Truly, I say to you, unless you turn and become like children, you will never enter the kingdom of heaven.
4 Whoever humbles himself like this child, he is the greatest in the kingdom of heaven.
5 "Whoever receives one such child in my name receives me;
10 "See that you do not despise one of these little ones; for I tell you that in heaven their angels always behold the face of my Father who is in heaven.
12 What do you think? If a man has a hundred sheep, and one of them has gone astray, does he not leave the ninety-nine on the mountains and go in search of the one that went astray?
13 And if he finds it, truly, I say to you, he rejoices over it more than over the ninety-nine that never went astray.
14 So it is not the will of my Father who is in heaven that one of these little ones should perish.

EWTN