Self-determination is the latest theory of human motivation as of 2020. This theory states that it is not an external reward that drives people, but more subtle internal needs of autonomy, mastery, and purpose. This follows Maslow's Pyramid as the upper rung, once basic needs have been met - so that people can achieve enlightnement. Once enlightenment is achieved, then the index of possibilities for individual increases - towards self-determination and freedom in balance with natural life support systems that include materials and energy.
notion of happiness seems to come from the Greeks, who defined it as "the exercise of vital powers along lines of excellence in a life affording them scop" - from Bill Joy - Why the Future Doesn't Need Us - 
- Marshmallow Experiment and meaning in one's life journey