Here are some quotes related to happiness along with the authors:

“Happiness depends upon ourselves.” – Aristotle
“To be kind to all, to like many and love a few, to be needed and wanted by those we love, is certainly the nearest we can come to happiness.” – Mary Stuart
“Happiness is not something ready-made. It comes from your own actions.” – Dalai Lama
“If you want happiness for an hour—take a nap. If you want happiness for a day—go fishing. If you want happiness for a year—inherit a fortune. If you want happiness for a lifetime—help someone else.” – Chinese Proverb
“It’s a helluva start, being able to recognize what makes you happy.” – Lucille Ball
“Don’t underestimate the value of Doing Nothing, of just going along, listening to all the things you can’t hear, and not bothering.” – Winnie the Pooh
“Some cause happiness wherever they go; others whenever they go.” – Oscar Wilde
“Happiness is not in the mere possession of money; it lies in the joy of achievement, in the thrill of creative effort.” – Franklin D. Roosevelt
“It’s been my experience that you can nearly always enjoy things if you make up your mind firmly that you will.” – L.M. Montgomery
“Since you get more joy out of giving joy to others, you should put a good deal of thought into the happiness that you are able to give.” – Eleanor Roosevelt
“Very little is needed to make a happy life; it is all within yourself, in your way of thinking.” – Marcus Aurelius Antoninus
“I’d far rather be happy than right any day.” – Douglas Adams
“The foolish man seeks happiness in the distance, the wise grows it under his feet.” – James Oppenheim
“Happiness is nothing more than good health and a bad memory.” – Albert Schweitzer
“I, not events, have the power to make me happy or unhappy today. I can choose which it shall be. Yesterday is dead, tomorrow hasn’t arrived yet. I have just one day, today, and I’m going to be happy in it.” – Groucho Marx
“If someone bases his/her happiness on major events like a great job, huge amounts of money, a flawlessly happy marriage or a trip to Paris, that person isn’t going to be happy much of the time. If, on the other hand, happiness depends on a good breakfast, flowers in the yard, a drink or a nap, then we are more likely to live with quite a bit of happiness.” – Andy Rooney
“If you want others to be happy, practice compassion. If you want to be happy, practice compassion.” – Dalai Lama
“Happiness is not a goal; it is a by-product.” – Eleanor Roosevelt
“The happiness of your life depends upon the quality of your thoughts: therefore, guard accordingly, and take care that you entertain no notions unsuitable to virtue and reasonable nature.” – Marcus Aurelius
“Most folks are as happy as they make up their minds to be.” – Abraham Lincoln
“Happiness is when what you think, what you say, and what you do are in harmony.” – Mahatma Gandhi
“There is only one happiness in this life, to love and be loved.” – George Sand
“If you want to be happy, be.” – Leo Tolstoy
“Money can’t buy you happiness, but it can buy you a yacht big enough to pull up right alongside it.” – David Lee Roth
“When ambition ends, happiness begins.” – Thomas Merton
“Happiness can exist only in acceptance.” – George Orwell
“Now and then it’s good to pause in our pursuit of happiness and just be happy.” – Guillaume Apollinaire
“A table, a chair, a bowl of fruit and a violin; what else does a man need to be happy?” – Albert Einstein
“I am determined to be cheerful and happy in whatever situation I may find myself. For I have learned that the greater part of our misery or unhappiness is determined not by our circumstance but by our disposition.” – Martha Washington
“True happiness is… to enjoy the present, without anxious dependence upon the future.” – Lucius Annaeus Seneca