I think it wasn't necessary of him to begrudge Leibniz, because he just published his own version of his work. The problem is that he published it first than Newton. If Newton had published it first, like he was urged to, right when he finished his work, he would have succeeded and gotten the glory of discovering calculus.
I don't understand why most geniuses are most genius behave so oddly, including Newton. As I've read through the different chapters, I've kind of seen that the weirder these men are, the bigger their intelligence is, though this stereotype doesn't always have to be true. But why? Why can't they just behave normally? Like I've asked before, do their peculiar habits have anything to do with their intellect? If they had behaved normally, perhaps the people in the time when they lived would have understood them better, and it would have been easier for them to work without criticism from the society of their time. Maybe the people's belief had something to do with their behavior, and influenced upon their work by making them doubt or discontinue it. Which kind of turned into a cycle, because then they acted even more odd, and people criticized them more, and so on.
They were often misunderstood because their insight was far greater than what people back then expected, but it wasn't just that fact, it was also that these men themselves didn't really try to display their knowledge openly to the public so that they could understand, as Newton shows when he refused to publish his work, or when he gave a student the simple reply of "I calculated it," instead of explaining the whole procedure of the problem to him.
