Breadth of heart is what is needed for all this. The weapon is the thought that nothing matters. It takes courage to say: "Nothing matters." It is the breadth of heart that makes a man great, whereas it is narrowness of heart that makes him small. The great heart does not think about how troublesome a person is, and why he should be bothered like this. It is only the narrow heart that thinks, "I will cause him some trouble." It may be justified, but still it is a narrow thought. The one with a broad heart thinks, "This is a small thing, I can put up with it; not much harm will come from it."