Once a saint visited a town for some days. During his stay saint would pray silently sitting under a tree. People got to know about him and would come to visit him to ask solution for their problems. In that town lived a very wealthy merchant. After observing saint for few days, was deeply touched by saint's devotion and sincerity. One day wealthy man went to saint and offered him a bag of gold saying, "I know you will use this money for good of other.. please accept it.."Saint replied, "Please wait a moment. I am not sure if it would be right for me to take your money,"Saint questioned, "Are you wealthy?? do you have more money at home??" Merchant proudly replied, "Yes.. I have thousand of more gold coins at home.."Saint again questioned, "Do you want thousands of more gold coins??" Merchant replied, "Why not.. I work hard everyday to earn more money.."Saint questioned, "Do you wish for yet thousands more gold pieces more beyond that..?" Merchant replied, "Certainly.. everyday I pray that I may earn more and more money.."Saint pushed back the bag of gold to merchant and said, "I am sorry but I can not take your money.."Merchant was surprised. He asked, "But why??"Saint replied, "A wealthy man can not take money from a beggar.."Wealthy man felt offended and spluttered, "How can you call me a beggar and yourself a wealthy man..?"Saint smiled and replied, "I am wealthy because I am content with whatever I have.. and you are a beggar because no matter how much you possess still you are always dissatisfied and begging for more.." 
Key to happiness is being content with whatever we have. . 