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.

Scientists expect to be improved on and corrected; they hope to be

Humanity has the stars in its future, and that future is too important to be lost under the burden of juvenile folly and ignorant superstition.

It is change continuing change, inevitable change that is the dominant factor in society today.

The day you stop learning is the day you begin decaying.

Oh, for a pin that would puncture pretension!

Any planet is 'Earth' to those that live on it.