True Happiness

In class we debated on what "true happiness" really is. Some believed that happiness is simply a pschycological feeling while others think that it is fulfilling your duty as person. This made me consider what i believe defines happiness. I see happiness as a pschycological feeling as well, but I believe that feeling of "true" happiness can only come from doing what is right as a person. Any sort of happiness derived from something impure is not real happiness. Thus, I believe both explainations on the definition have merit.