Science fiction - and the correct shortcut is 'sf' - uses actual scientific facts or theories for the source ideas or framework of the story. It has some scientific content, however speculative. If it breaks a law of physics, it knows it's doing so and follows up the consequences. If it invents a society of aliens, it does so with some respect for and knowledge of the social sciences and what you might call social probabilities. And some of it is literarily self-aware enough to treat its metaphors as metaphors.

Go to bed; tired is stupid.

There have been great societies that did not use the wheel, but there have been no societies that did not tell stories.

My imagination makes me human and makes me a fool; it gives me all the world, and exiles me from it.

Without war there are no heroes. What harm would that be? Oh, Lavinia, what a woman's question that is.

But it doesn't take a thousand men to open a door, my lord." "It might to keep it open.

I certainly wasn't happy. Happiness has to do with reason, and only reason earns it. What I was given was the thing you can't earn, and can't keep, and often don't even recognize at the time; I mean joy.