The value of Newton's theories themselves can quite easily be checked, independently of the quality of his epistemology.
For a philosopher like Hegel, it's much harder to dissociate the different bits of what he wrote, and if one part looks rotten, there's no obvious place to cut.
(What's more, Newton's obsession with alchemy would discourage me from reading whatever Newton had to say about science in general)
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July Part 1