In the above linked article, several Douglas Adams quotes are listed. I use some of them frequently, since the Hitchhikers books are some of my favorites.
Here are some of my favorite quotes from the list, and several that I use often.
‘The Answer to the Great Question…Of Life, the Universe and Everything…Is…Forty-two.’
― The Hitchhiker’s Guide to the Galaxy
‘I love deadlines. I love the whooshing noise they make as they go by.’
― The Salmon of Doubt
‘I’d far rather be happy than right any day.’
― The Hitchhiker’s Guide to the Galaxy