Plato

The original entrepreneur may initiate the initial purpose, but, in a sense, like a parent that has children, the children have their own destiny, and at some point, that can veer off away from the wishes the parent might have for it.

Nine years after I had my own accident, I find that in trying to go back to doing those things that I used to do just doesn't fit. Everything seems to just fall apart. I don't know why but I think it is because I am this new creature.

The historical novelist has to consider what has actually happened, while the SF writer is dealing in possibilities, but they are both in the business of imagining a world unlike our own and yet connected to it.