There is a wonderful TED talk by Shawn Achor in which he explains that most people have the success and happiness equation backwards. Whereas most people believe achieving greater success will result in more happiness, he argues that being a happier person will make you much more successful. He goes on to say that happier and less stressed doctors are 19% faster and more accurate in diagnosing patients.
Personal Blog of Alex Mohseni, focusing on Innovation and Technology in Health and Medicine