Until I became a published writer, I remained completely ignorant of books on how to write and courses on the subject ... they would have spoiled my natural style; made me observe caution; would have hedged me with rules.

The saddest aspect of life right now is that science gathers knowledge faster than society gathers wisdom.

We all know we fall. Newton's discovery was that the moon falls, too-and by the same rule that we do.

A fire-eater must eat fire even if he has to kindle it himself.

Science can be introduced to children well or poorly. If poorly, children can be turned away from science; they can develop a lifelong antipathy; they will be in a far worse condition than if they had never been introduced to science at all.

There is an art to science, and a science in art; the two are not enemies, but different aspects of the whole.

A robot must protect its own existence as long as such protection does not conflict with the First or Second Laws.