Just read some stuff by Richard Carlson which I’m sure you will find interesting:

“Happiness is a state of mind, not a set of circumstances. You can never find happiness by searching because happiness is not found outside yourself. When you attach conditions to your happiness, you won’t experience it… Excessive thinking about your past and your problems will convince you that you have good reasons to be upset and unhappy. You can learn from your past, but it is a mistake to continually go into your past or overanalyze life in a search for happiness… Happiness requires no effort at all. It is more of a letting go of unhappiness than it is a striving for happiness.”