Pointing to previous answers is not intended to discourage further questions, discussion, debate, or rebuttal.

In "How did early/medieval Christians (or monotheistic religions in general) make sense of lightning?" at https://www.reddit.com/r/AskHistorians/comments/5yeslf/how_did_earlymedieval_christians_or_monotheistic/deud28k/ , /u/link0007 provided Aristotle's answer, and therefore of the Arab philosophers that followed him.