Fantasy is literature for teenagers.

I have had wealth, rank and power, but, if these were all I had, how wretched I should be.

Science fiction is for real, space opera is for fun.

Why had I become a writer in the first place? Because I wasn't fit for society; I didn't fit into the system.

Keep violence in the mind Where it belongs (Barefoot in the Head)

Science fiction is no more written for scientists than ghost stories are written for ghosts.

There are two kinds of writer: those that make you think, and those that make you wonder.