You keep a fish, and you'll be very sad when it dies. You keep a pond of fish, and you won't even notice when one dies. When one person scolds you, you desperately want to explain; when ten thousand people scold you, you can't even bother to lift your head. Pain comes from having too little; entanglement comes from a small world. When you broaden your perspective, you'll realize that many things are not worth affecting your mood at all. The bigger your heart, the smaller the problems become.