Don't Panic

Ford handed the book to Arthur.
"What is it?" asked Arthur.
"The Hitch Hiker's Guide to the Galaxy. It's a sort of electronic book. It tells you everything you need to know about anything. That's it's job."
Arthur turned it over nervously in his hands.
"I like the cover," he said. "Don't Panic. It's the first helpful or intelligible thing anybody's said to me all day."

Today would have been Douglas Adams' 61st birthday. He got a Google doodle to mark the occasion.  
We miss you, you hoopy frood.