If our minds are ruled by destructive emotions, by self-centredness, with little regard for others, we won’t be happy. As social animals we need to work together. With friends around us, we feel secure, happy and our minds are calm. We’re physically well too. When we’re filled with anger, fear and frustration, our minds are upset and our health declines. Therefore, the ultimate source of happiness is warmheartedness.

The Dalai Lama