The first ten million years were the worst," said Marvin, "and the second ten million years, they were the worst too. The third ten million years I didn't enjoy at all. After that I went into a bit of a decline.

See first, think later, then test. But always see first. Otherwise you will only see what you were expecting. Most scientists forget that.

Time doesn't necessarily happen in chronological order.

One of the things Ford Prefect had always found hardest to understand about humans was their habit of continually stating and repeating the very very obvious.

"I think we have different value systems." "Well, mine's better."

The Electric Monk was a labour-saving device, like a dishwasher or a video recorder... Electric Monks believed things for you, thus saving you what was becoming an increasingly onerous task, that of believing all the things the world expected you to believe.

Anything that thinks logically can be fooled by something else that thinks at least as logically as it does.