Summary

Emanuel Swedenborg Heaven and Hell — Chapter XV, Light and Heat in Heaven

As Divine truth is light in the heavens, so all truths wherever they are, whether within an angel or outside of him, or whether within the heavens or outside of them, emit light. Nevertheless, truths outside of the heavens do not shine as truths within the heavens do. Truths outside of the heavens shine coldly, like something snowy, without heat, because they do not draw their essence from good, as truths within the heavens do; therefore that cold light vanishes as soon as the light of heaven falls on it, and if there is evil underneath it it is turned into darkness.
Source: Wikisource

Emanuel Swedenborg Heaven and Hell — Chapter XV, Light and Heat in Heaven

This is more clearly shown by the heat and light of the world, to which the heat and light of heaven correspond. By the world's heat when conjoined with light, as in spring and summer, all things on the earth are quickened and grow, but by light separate from heat nothing is quickened or grows, but everything lies torpid and dies. They are not conjoined in winter, when heat is absent though light remains. From this correspondence heaven is called paradise, since truth is there joined with good, or faith with love, as light is with heat in springtime on the earth.
Source: Wikisource

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