Unless you are converted and become as little children, you will by no means enter the kingdom of heaven.
When speaking of genuine salvation, Jesus made an apt comparison to the characteristics of young children. To be saved, you must come to Christ with the dependent attitude and outlook of a little child: simple, helpless, trusting, unaffected, unpretentious, and unambitious.
It’s not that children are without sin, but that they are naïve and unassuming, dependent on others and free from selfish claims to grandeur. They submit to the care of their parents and other loved ones, relying on them to meet all their needs. That’s the kind of humble and dependent attitude anyone must have who seeks to enter the kingdom of Jesus Christ.