Two possibilities exist: either we are alone in the Universe or we are not. Both are equally terrifying.
The only way of discovering the limits of the possible is to venture a little way past them into the impossible.
The universe is not only stranger than we imagine, it's stranger than we can imagine.
Any sufficiently advanced technology is indistinguishable from magic.
Human judges can show mercy. But against the laws of nature, there is no appeal.
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.
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.