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.

33. Let it be clearly understood that with the angels it is the interiors that cause them to be in one heaven or another; for as their interiors are more open to the Lord they are in a more interior heaven. There are three degrees of interiors in each angel and spirit, and also in man. Those in whom the third degree is opened are in the inmost heaven. Those in whom the second degree is opened, or only the first, are in the middle or in the outmost heaven. The interiors are opened by reception of Divine good and Divine truth. Those who are affected by Divine truths and admit them at once into the life, thus into the will and into action therefrom, are in the inmost or third heaven, and have their place there in accordance with their reception of good from affection for truth. Those who do not admit truths at once into the will but into the memory, and thence into the understanding, and from the understanding will and do them, are in the middle or second heaven. But those who live morally and who believe in a Divine, and who care very little about being taught, are in the outmost or first heaven. ¹ From this it is clear that the states of the interiors are what make heaven, and that heaven is within everyone, and not outside of him; as the Lord teaches when He says:

The kingdom of God cometh not with observation, neither shall they say, Lo here, or Lo there; for behold the kingdom of God ye have within you (Luke 17:20, 21).

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