George Bernard Shaw : "Do not do unto others as you would that they should do unto you. Their tastes may not be the same." 
"Happiness consists more in small conveniences or pleasures that occur every day, than in great pieces of good fortune that happen but seldom." – Benjamin Franklin 
"Man's real life is happy, chiefly because he is ever expecting that it soon will be so." – Edgar Allan Poe 
"A man should always consider how much he has more than he wants, and how much more unhappy he might be than he really is." – Joseph Addison 
"Happiness is an expression of the soul in considered actions." –  Aristotle 
"All happiness depends on courage and work." –  Honore de Balzac 
"Man needs, for his happiness, not only the enjoyment of this or that, but hope and enterprise and change." –  Bertrand Russell 
"I believe in the possibility of happiness, if one cultivates intuition and outlives the grosser passions, including optimism." –  George Santayana 
No one is in control of your happiness but you,therefore,you have the power to change anything about yourself or your life that you want to change. -ALM
There is only one way to happiness, and that is to cease worrying things which are beyond the power of our will.