Never fear quarrels, but seek hazardous adventures.
That's chess! You've got to make some sacrifices!
Scientists are a friendly, atheistic, hard-working, beer-drinking lot whose minds are preoccupied with sex, chess and baseball when they are not preoccupied with science.
One of the biggest roles of science fiction is to prepare people to accept the future without pain and to encourage a flexibility of mind. Politicians should read science fiction, not westerns and detective stories.
As our own species is in the process of proving, one cannot have superior science and inferior morals. The combination is unstable and self-destroying.
Human judges can show mercy. But against the laws of nature, there is no appeal.
Millions long for immortality who don't know what to do with themselves on a rainy Sunday afternoon.
Hitch your wagon to a star.
Art is a jealous mistress.