I think we made love three times that final summer. Made love! Preposterous euphemism for fucking, almost as bad as the most grotesque of all, slept … - Robert Silverberg

In the absolute universe all events can be regarded as absolutely deterministic, and if we can’t perceive the greater structures, it’s because our vision is faulty. If we had a real grasp of causality down to the molecular level, we wouldn’t need to rely on mathematical approximations, on statistics and probabilities, in making predictions. If our perceptions of cause and effect were only good enough, we’d be able to attain absolute knowledge of what is to come. We would make ourselves all-seeing.

The Barjazid does not yet rule as an absolute tyrant, for that might turn the people against him, and he is still insecure in his power—while you live. But he rules for himself and for his family, not for Majipoor. He lacks a sense of right, and does only what seems useful and expedient. As his confidence grows, so too will his crimes, until Majipoor groans under the whip of a monster.

I have come to prefer something looser, a rough sort of definition which says simply that science fiction attempts to portray that which does not exist, a speculative reality, but endeavors to explore the consequences of such a speculation in a rigorous, systematic, and scientifically plausible way.