Our starvation is a physical manifestation of our inner hunger. Our infections are manifestations of our inner disease. Our wars are manifestations of our divisions within ourselves.
It is for this reason that people in America are depressed. When you remove the physical manifestations of suffering, the suffering does not go away; its spiritual nature simply becomes more obvious. Then we call it depression.
If you want to end world hunger, learn to feel full and happy. If you want to cure cancer, learn to be in harmony with yourself. If you want to fight pollution, learn to think pure and beautiful thoughts.
You can’t remove other people’s pain. But people can’t learn to remove their own pain if they don’t have an example to follow.
That poor man that you refused to help? That suffering animal that you neglected and let die? You are him. You are it. The world is your body; end your suffering and you end all suffering. Save yourself and you save the world.