"Humans think they are smarter than dolphins because we build cars and buildings and start wars etc...and all that dolphins do is swim in the water, eat fish and play around. Dolphins believe that they are smarter for exactly the same reasons."
— Douglas Adams

"There is a theory which states that if ever anyone discovers exactly what the Universe is for and why it is here, it will instantly disappear and be replaced by something even more bizarre and inexplicable.
There is another theory which states that this has already happened."
— Douglas Adams (The Restaurant at the End of the Universe)

"Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so."
— Douglas Adams

"The major problem- one of the major problems, for there are several- one of the many major problems with governing people is that of whom you get to do it; or rather of whom manages to get people to let them do it to them.
To summarize: it is a well-known fact that those people who want to rule people are, ipso facto, those least suited to do it.
To summarize the summary: anyone who is capable of getting themselves made President should on no account be allowed to do the job."
— Douglas Adams (The Hitchhiker's Guide to the Galaxy)

"The problem with designing something completely foolproof is to underestimate the ingenuity of a complete fool. "
— Douglas Adams (The Hitchhiker's Guide to the Galaxy)