To introduce something altogether new would mean to begin all over, to become ignorant again, and to run the old, old risk of failing to learn.

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

I don't expect to live forever, nor do I repine over that, but I am weak enough to want to be remembered forever. - Yet how few of those who have lived, even of those who have accomplished far more than I have, linger on in world memory for even a single century after death

We all know we fall. Newton's discovery was that the moon falls, too-and by the same rule that we do.

I, on the other hand, am a finished product. I absorb electrical energy directly and utilize it with an almost one hundred percent efficiency. I am composed of strong metal, am continuously conscious, and can stand extremes of environment easily. These are facts which, with the self-evident proposition that no being can create another being superior to itself, smashes your silly hypothesis to nothing.

The final end of Eternity, and the beginning of Infinity

All roads lead to Trantor, says the old proverb, and that is where all stars end.