Newton was a nut, in nearly every positive and negative, sense of the word.

I highly recommend James Gleick's Isaac Newton: https://www.amazon.com/Isaac-Newton-James-Gleick/dp/14000329...

It is an engrossing and not long read on Newton. It covers a fair amount of his heretical thoughts and feuds with people and paints a rather complete picture of the man. It's basically common knowledge now, but Newton's writings on alchemy and religion are in vast excess of his writings on physics and mathematics. It seems that intriguing questions that he couldn't find answers for almost made him rabid, in a sense.