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.

346. Wise and Simple People in Heaven

People think that wise individuals will have more glory and renown in heaven than simple people because it says in Daniel, "The intelligent will shine like the radiance of the firmament, and those who have justified many, like stars forever" (Daniel 12:3). However, not many people know who are meant by "the intelligent" and "those who justify." The common opinion is that these are the people we call scholarly and learned, especially the ones who have had teaching roles in the church and have surpassed others in doctrine and in preaching - even more so if they are among those who have converted many to the faith. People like this are all considered "intelligent" in the world; but still, the people this verse is about are not intelligent in heaven unless their intelligence is the heavenly intelligence that we are about to describe.