Mat 18:4 Whoever therefore shall humble himself as this little child, the same is greatest in the kingdom of heaven.

This line is typical of Christ's teaching that you receive the reverse in the spiritual world for what you do in the physical world. In this case, if you lessen yourself on earth, you become great in heaven. If you become a child on earth, then you become an adult in heaven.

"Humble" is tapeinoô, which means "to lower," "to reduce," "to lessen," "to disparage," "to minimize," and "to humble."

"Greatest" is from meizôn, which is the comparative adjective form of megas (great), which means "big," "full grown," "great," "might" and "strong."