The reason is that in the Christian heavens there is heavenly light, which is Divine truth, and heavenly heat, which is Divine love. These two disclose the nature of truths and kinds of good, and the nature of evils and falsities. This is why all communication between the Christian and Mohammedan heavens has been closed off. It is the same with the heavens of the heathen. If there were any communication, only those could be saved who enjoy heavenly light combined with heavenly heat coming from the Lord. Indeed, neither could they be saved, if their heavens were linked together. For this would so undermine the foundations of all the heavens, that the angels could not go on living there. For unchastity and wantonness from the Mohammedans would exert an influence on the Christian heaven which would be intolerable, and chastity and purity from the Christians would exert an influence on the Mohammedan heaven, which would be no more tolerable there. By being in communication and therefore linked Christian angels would become natural and thus adulterers; or, if they remained spiritual, they would continually feel the wantonness around them, which would cut off all the blessedness of their life. A parallel event would occur in the Mohammedan heaven, for the spiritual ideas of the Christian heaven would continually surround and torture them, taking away all their pleasure in life, and in addition instilling the idea that polygamy was a sin, so that they would be constantly criticised.

This is the reason why all the heavens are completely isolated, so that there is no link possible between them, except through the light and heat flowing into them from the Lord, out of the sun in whose midst He is. This radiation enlightens and gives life to each individual in proportion to his ability to receive it; and this depends on his religion. This kind of communication is possible, but not between one heaven and another.

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