“Any planet is 'Earth' to those that live on it.”

“From my close observation of writers... they fall into two groups: 1) those who bleed copiously and visibly at any bad review, and 2) those who bleed copiously and secretly at any bad review.”

“Life would be impossible on such a planet. It wouldn't get enough heat and light, and if it rotated there would be total darkness half of every day. There wouldn't be any native inhabitants. You couldn't expect life---which is fundamentally dependent on light---to develop under such extreme conditions of light deprivation. Half of every axial rotation spent in Darkness! No, nothing could exist under conditions like that.”

“Every man's position on Earth is restricted to the distance he can walk.'-- "The Last Trump”

“All the hundreds of millions of people who, in their time, believed the Earth was flat never succeeded in unrounding it by an inch.”

“Those people who think they know everything are a great annoyance to those of us who do.”

“Earthmen may even rule at Trantor for a generation, but their children will become Trantorians, and in their turn will look down upon the remnant on Earth.”