Verses 1-5. The subject of the entire chapter is the worship of the Lord from a state of freedom when regeneration is completed, and also occasionally during regeneration; and such worship from natural good is described

Verses 6-11. Then such worship from the good of innocence involved in charity, or love to the neighbour

Verses 12-16. And lastly, such worship from the good of faith, which is charity manifested through the understanding.

Verse 17. But in every state of the worship of the Lord, no one can appropriate either truth or good as his own independently of the Lord.

A child is a young boy or girl in the care of parents, older than a suckling or an infant, but not yet an adolescent. "Children" are sometimes used as a name for a large group of descendants of one person, such as the Children of Israel, or even all human beings as the Children of Men. A child represents innocence and charity, where innocence is the willingness to be led, and charity is love. This is why Jesus blessed them and suggested that we all become like children in order to enter heaven.