Success and happiness are two sides of the same coin called purpose.
We all have a purpose in life. We were all created to do something that is greater than the accumulation of wealth. Real success in life can only be measured by the accomplishment of one's intended purpose. You are successful when you do what you were created to do. Until you truly understand why you are here, you can never put the energy needed to bring it to pass. It is the pursuit of this passion that leads to true success and happiness.