Summary

Emanuel Swedenborg Heaven and Hell — Chapter V, There are Three Heavens

Only he who knows how degrees are related to Divine order can comprehend how the heavens are distinct, or even what is meant by the internal and the external man. Most men in the world have no other idea of what is interior and what is exterior, or of what is higher and what is lower, than as something continuous, or coherent by continuity, from purer to grosser.
Source: Wikisource

Emanuel Swedenborg Heaven and Hell — Chapter V, There are Three Heavens

On the other hand, degrees that are not continuous, but discrete, are distinguished like prior and posterior, like cause and effect, and like what produces and what is produced. Whoever looks into the matter will see that in each thing and all things in the whole world, whatever they are, there are such degrees of producing and compounding, that is, from one a second, and from that a third, and so on.
Source: Wikisource

Emanuel Swedenborg Heaven and Hell — Chapter V, There are Three Heavens

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.
Source: Wikisource

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