Magic's just science that we don't understand yet.

The exploration of the planets is now closer to us in time than the exploration of Africa by Stanley and Livingstone.

A faith that cannot survive collision with the truth is not worth many regrets.

The goal of the future is full unemployment, so we can play. That's why we have to destroy the present politico-economic system.

The creation of wealth is certainly not to be despised, but in the long run the only human activities really worthwhile are the search for knowledge, and the creation of beauty. This is beyond argument, the only point of debate is which comes first.

Science fiction seldom attempts to predict the future. More often than not, it tries to prevent the future.

The choice, as Wells once said, is the Universe-or nothing. . . . The challenge of the great spaces between the worlds is a stupendous one; but if we fail to meet it, the story of our race will be drawing to its close. Humanity will have turned its back upon the still untrodden heights and will be descending again the long slope that stretches, across a thousand million years of time, down to the shores of the primeval sea.