Luke 18:15-17 and Matthew 18:2-5 (NRSV)
People were bringing even infants to him that he might touch them; and when the disciples saw it, they sternly ordered them not to do it. But Jesus called for them and said, "Let the little children come to me, and do not stop them; for it is to such as these that the kingdom of God belongs. Truly I tell you, whoever does not receive the kingdom of God as a little child will never enter it." He called a child, whom he put among them, and said, "Truly I tell you, unless you change and become like children, you will never enter the kingdom of heaven. Whoever becomes humble like this child is the greatest in the kingdom of heaven. Whoever welcomes one such child in my name welcomes me.
How often do I let the cares of this world steal my joy and make me grow old before my time. What a thought, the Kingdom of God belongs to those with childlike faith.