Why did Jesus say that one should become like a child to enter the kingdom of God?

[Shri Anil asked: People brought children to Jesus for blessing them. Seeing these disciples rebuked them. Then Jesus told that let the little children come to Him, because the kingdom of God belongs to those who are like children. He also told that unless one becomes like a child they cannot enter kingdom of God. Swami, please explain why Jesus told like this?]

Swami replied:- The child is always in the minimum most level of sin since it has just returned from the hell after undergoing punishments for all its sins. Such souls only can enter the kingdom of God. But, the adults become sinners since the child acquires all sinful qualities from the surroundings as it grows.