Where did Mohammed get such knowledge from if not from God?

Where did Mohammed get such knowledge from if not from God?​

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Just think about the world 1400 years ago and the level of knowledge that existed, or perhaps we should say the level ignorance that was prevalent, especially in regards to the natural world. Of course some thinkers and philosophers had made some amazing discoveries, even estimating the circumference of the earth, but they also got a lot of things very wrong.