A sense of contentment is crucial to being happy. Physical health, material wealth and friends contribute to this, but contentment governs our relations with them all.
Dalai LamaThere is no self-interest completely unrelated to others' interests. Due to the fundamental interconnectedness which lies at the heart of reality, your interest is also my interest. From this it becomes clear that "my" interest and "your" interest are intimately connected. In a deep sense, they converge.
Dalai Lama