While we understand today that the further down into earth you dig the hotter it gets, in the middle ages people would dig root cellars to keep things cold so perhaps they understood the easily accessible parts of the depths as colder than the surface.
The idea was that the heart of Hell was cold because it was the furthest from Gods love.
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If you want a religion that follows conventional laws of thermodynamics, Christianity is not for you.
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Scientology of course!
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Scientologists don’t actually follow science in any meaningful way. Their way of thinking is to follow the leader and ask no questions.
If you really wanted to talk about thermodynamics in religion, I’m sure there’s some nerdy pastor out there who can relate creation to entropy.
While we understand today that the further down into earth you dig the hotter it gets, in the middle ages people would dig root cellars to keep things cold so perhaps they understood the easily accessible parts of the depths as colder than the surface.