...;he was at home whenever he could quench his thirst for knowledge;... - Stanisław Lem

I was already thinking there was no way out of the vicious circle of madness — after all, no one can think with anything but his brain, no one can be outside himself to check whether the processes taking place in his body are normal.

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.

"And do you believe in God?" "I do." "But you didn't think a robot would, right?" "Right."