In the presence of total Darkness, the mind finds it absolutely necessary to create light.

Self-education is, I firmly believe, the only kind of education there is.

It's your fiction that interests me. Your studies of the interplay of human motives and emotion.

Do not forget that a traitor within our ranks, known to us, can do more harm to the enemy than a loyal man can do good to us.

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.

University President: Why is it that you physicists always require so much expensive equipment? Now the Department of Mathematics requires nothing but money for paper, pencils, and erasers . . . and the Department of Philosophy is better still. It doesn't even ask for erasers.

Surely, if we take on thinking partners - or, at the least, thinking servants - in the form of machines, we will be more comfortable with them, and will relate to them more easily, if they are shaped like humans. It will be easier to be friends with human-shaped robots than with specialized machines of unrecognizable shape. And I sometimes think that, in the desperate straits of humanity today, we would be grateful to have nonhuman friends, even if they are only the friends we build ourselves.