There are certain spiritual traditions where the goal is to achieve a permanent of bliss: samadhi/Nirvana/enlightenment etc. Some of these schools of thought go back 5000+ years and the philosophy and science of happiness has been worked out in great details. I'm a recent convert to Nondualism and right now all I want to do is to meditate. Sometimes it's so peaceful and blissful that everything else pales in comparison.