Personally I'd say that happiness is such an ill-defined state that it's not a topic that can be debated a lot. A more objective term might be satisfied. The a

Personally I'd say that happiness is such an ill-defined state that it's not a topic that can be debated a lot. A more objective term might be satisfied. The author is satisfied by his life and does not yearn for something else. Maybe that's as close as you can get?