Going through the Christian beliefs, there was no sun before it was created in Genesis(duh), so the light that was there had to come from somewhere else. The Bible (to my knowledge) doesn't have any reference to what light was before the sun, but Tolkien could've gotten this particular idea from another source like was mentioned before or he could have gotten an idea from nowhere and that could have sparked his imagination to go somewhere else with it. But wherever he got the idea for the two trees, Tolkien probably had to change it somewhat...
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