Happy indeed is the scientist who not only has the pleasures which I have enumerated, but who also wins the recognition of fellow scientists and of the mankind which ultimately benefits from his endeavors.
However, the difficulties and pleasures of the writing itself are similar for a novel with a historical setting and a novel with a contemporary setting, as far as I'm concerned.
For me, even in my first book, the pleasures of writing anything magical is that it has to be physical. It has to be grounded and very much in this world. Then, I get to play with all the consequences of this new thing.
To me, the idea of heaven would give you certain pleasures, certain joys - but it's very important to have an intellectual understanding of why you want those things.