Summary

Emanuel Swedenborg Heaven and Hell — Chapter XXXVII, Little Children in Heaven

They are merely in the rudiments of a capacity to become angels, for children are not angels but become angels. For everyone passing out of this world enters the other in the same state of life, a little child in the state of a little child, a boy in the state of a boy, a youth, a man, an old man, in the state of a youth, a man, or an old man; but subsequently each one's state is changed. The state of little children surpasses the state of all others in that they are in innocence, and evil has not yet been rooted in them by actual life
Source: Wikisource

Emanuel Swedenborg Heaven and Hell — Chapter XXXVII, Little Children in Heaven

Let them know therefore that every child, wherever he is born, whether within the church or outside of it, whether of pious parents or impious, is received when he dies by the Lord and trained up in heaven, and taught in accordance with Divine order, and imbued with affections for what is good, and through these with knowledges of what is true; and afterwards as he is perfected in intelligence and wisdom is introduced into heaven and becomes an angel. Everyone who thinks from reason can be sure that all are born for heaven and no one for hell, and if man comes into hell he himself is culpable
Source: Wikisource

Emanuel Swedenborg Heaven and Hell — Chapter XXXVII, Little Children in Heaven

The innocence of children has been represented to me as a wooden sort of thing, almost devoid of life, which becomes vivified as they are perfected by knowledges of truth and affections for good. Afterwards genuine innocence was represented by a most beautiful child, naked and full of life; for the really innocent, who are in the inmost heaven and thus nearest to the Lord, always appear before the eyes of other angels as little children, and some of them naked
Source: Wikisource

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