The basic thing is that everyone wants happiness, no one wants suffering. And happiness mainly comes from our own attitude, rather than from external factors. If your own mental attitude is correct, even if you remain in a hostile atmosphere, you feel happy.
If we ourselves remain angry and then sing world peace, it has little meaning. First, our individual self must learn peace. This we can practice. Then we can teach the rest of the world.
Tenzin Gyatso, 14th Dalai Lama