A Vulgar Mechanick can practice what he has been taught or seen done, but if he is in an error he knows not how to find it out and correct it, and if you put him out of his road he is at a stand. Whereas he that is able to reason nimbly and judiciously about figure, force, and motion, is never at rest till he gets over every rub. (from a letter dated 25 May, 1694)

A manuscript he sent to John Locke in which he disputed the existence of the Trinity remained unpubliIsaac Newtond until 1785 more than half a century after his death. Petitioning Parliament Chaloner accused the Mint of providing tools to counterfeiters (a charge also made by others). )
In 1704 Newton publiIsaac Newtond Opticks in which he expounded his corpuscular theory of light.

Newton also made seminal contributions to optics and shares credit with Gottfried Leibniz for the invention of the infinitesimal calculus. He was a devout but unorthodox Christian and unusually for a member of the Cambridge faculty he refused to take holy orders in the Church of England perhaps because he privately rejected the doctrine of trinitarianism. In addition to his work on the mathematical sciences Newton also dedicated much of his time to the study of alchemy and biblical chronology but most of his work in those areas remained unpubliIsaac Newtond until long after his death.