When we seek happiness through accumulation, either outside of ourselves--from other people, relationships, or material goods--or from our own self-development, we are missing the essential point. In either case we are trying to find completion. But according to Buddhism, such a strategy is doomed. Completion comes not from adding another piece to ourselves but from surrendering our ideas of perfection.
Source: Going to Pieces without Falling Apart: A Buddhist Perspective on Wholeness