Of the two powers, the two categories that take possession of us when we enter the world (from where?), space is by far the less mysterious. It, too, undergoes transformations. Time, on the other hand, is a hostile element, truly treacherous, I would even say against human nature.

No one reads; if someone does read, he doesn't understand; if he understands, he immediately forgets.

And yet we knew, for a certainty, that when first emissaries of Earth went walking among the planets, Earth's other sons would be dreaming not about such expeditions but about a piece of bread.

Do not trust people. They are capable of greatness.

How do you expect to communicate with the ocean, when you can’t even understand one another?

The first 90% of the job takes 90% of the time. The remaining 10% of the job requires another 90% of the time. The first condition of immortality is death.

A smart machine will first consider which is more worth its while: to perform the given task or, instead, to figure some way out of it.