Robert Louis Stevenson (born Robert Lewis Balfour Stevenson; 13 November 1850 – 3 December 1894) was a Scottish novelist, essayist, poet and travel writer. He is best known for works such as Treasure Island, Strange Case of Dr Jekyll and Mr Hyde, Kidnapped and A Child's Garden of Verses.
The unhappy person resents it when you try to cheer him up, because that means he has to stop dwelling on himself and start paying attention to the universe. Unhappiness is the ultimate form of self-indulgence. When you’re unhappy, you get to pay a lot of attention to yourself. You get to take yourself oh so very seriously.
—Tom Robbins in Jitterbug Perfume
Whoever is happy will make others happy too.
Happiness is nothing more than good health and a bad memory.