I love good books, so let me make a recommendation-Reordered love, reordered lives: learning the deep meaning of happiness is a keeper. The author David Naugle is the chair and professor of philosophy at Dallas Baptist University.
My take away from the book is that when we are in a right relationship with God; it is then that we can experience true happiness, or as David notes in the book true Shalom (fullness, completeness).
When our love is properly placed (loving God first) then our lives will be reordered (happy, and contented).
If you are moved to purchase the book come back to my blog and we can have a fruitful discussion.