If such a thing had happened once, it must surely have happened many times in this galaxy of a hundred billion suns.

All explorers are seeking something they have lost. It is seldom that they find it, and more seldom still that the attainment brings them greater happiness than the quest.

The phenomenon of UFO doesn't say anything about the presence of intelligence in space. It just shows how rare it is here on the earth.

If such a thing had happened once, it must surely have happened many times in this galaxy of a hundred billion suns.

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

Any technology distinguishable from magic is insufficiently advanced.

They had not yet attained the stupefying boredom of omnipotence; their experiments did not always succeed.