‎If you ever find you need help again, you know, if you're in trouble, need a hand out of a corner..." "Yeah?" "Please don't hesitate to get lost.

From another direction he felt the sensation of being a sheep startled by a flying saucer, but it was virtually indistinguishable from the feeling of being a sheep startled by anything else it ever encountered, for they were creatures who learned very little on their journey through life, and would be startled to see the sun rising in the morning, and astonished by all the green stuff in the fields.

I tend to get very suspicious of anything that thinks it's art while it's being created.

The technology involved in making anything invisible is so infinitely complex that nine hundred and ninety-nine billion, nine hundred and ninety-nine million, nine hundred and ninety-nine thousand, nine hundred and ninety-nine times out of a trillion it is much simpler and more effective just to take the thing away and do without it.

Arthur felt happy. He was terribly pleased that the day was for once working out so much according to plan. Only twenty minutes ago he had decided he would go mad, and now here he was already chasing a Chesterfield sofa across the fields of prehistoric Earth.

We demand rigidly defined areas of doubt and uncertainty!

The difference between us and a computer is that, the computer is blindingly stupid, but it is capable of being stupid many, many million times a second.