[ytturbed]

I would say that by and large it's actually the social people who get lonely. They need the acceptance of others in order to feel good about themselves. Newton had his God and his work. Sure, there's 'more to life' but bear in mind that by any reasonable measure his work was full of life and, logically, every choice he made precluded other choices. We're all the beneficiaries of those choices and I expect they were intensely meaningful to him.