this article about Lolita author Nobakov is a great example of passion- a man who found completely diverse talents and purposes for himself and worked at those things in his life in order to leave behind something that was bigger than himself. And even more than that, with his passion for butterflies, by contributing to their study and discovering new species, that kind of contribution is completely separate from himself, and is purely a documentation of nature. No subjectivity involved. In fact it is totally the opposite. Whereas with his writing he was operating on a level purely of himself and his experiences. Totally subjective.
I wonder what other examples of this there may be.