“It must be wonderful to be seventeen, and to know everything.”

“Now I'm a scientific expert; that means I know nothing about absolutely everything.”

“The more wonderful the means of communication, the more trivial, tawdry, or depressing its contents seemed to be.”

“Those wanderers must have looked on Earth, circling safely in the narrow zone between fire and ice, and must have guessed that it was the favourite of the Sun's children.”

“The time was fast approaching when Earth, like all mothers, must say farewell to her children.”

“A man who grows that much hair,' critics were fond of saying, 'must have a lot to hide.”

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