The 'ying and yang' of life, I guess. No, I personally don't 'need' them (e.g., covet anything they could offer me, such as praise, compensation, approval, etc.). Nevertheless, I feel an obligation to help others, to serve them. It's a religious feeling. One of my all-time favorites is Mother Teresa. She walked the ghetto-streets of Calcutta, reaching down into heaps of garbage, gutters, the mud, to pull back into the World of the Living, those whom society had deemed 'untouchable', unworthy of life, human-filth. With her bare hands she reached down, grabbed them, held them, restored them, without hesitation. In the service of others, nothing was beneath her. That was her purpose.