Love, kindness, compassion, and tolerance are qualities common to all great religions, and whether or not we follow any particular religious tradition, the benefits of love and kindness are obvious to anyone. What is compassion? Compassion is the source of happiness. Compassion gives inner strength to keep calm in any situation. Compassion has two functions: it causes our brain to function better and it brings inner strength. These, then, are the causes of happiness. .