In this interesting transcript of a talk about Lama Zopa Rinpoche, he explains what a hero is within a spiritual context:
The real bravery, the real hero is the person who can fight anger, and can overwhelm and climb over anger. The real hero is the person who can face the most difficult and dangerous enemy—the inner enemy.
One person’s anger can kill sixty million people. That is how dangerous anger is—it is much more dangerous than an atomic bomb. There is no comparison between one person’s anger and an atomic bomb. Anger is much more harmful than an atomic bomb.
The danger of an atomic bomb is that it harms others and it can destroy the whole earth—more than half of the world—millions and millions of human beings and creatures. There are so many creatures—uncountable numbers in the water, under the ground, in the bushes and in the sky. There are so many, it is unbelievable. All this gets destroyed—not only human beings, but also creatures and so many buildings, bridges and cities. All these things that thousands and thousands of people for many years planned and spent so much money on, and worked so hard in order to collect the money to give to the workers—all these enjoyments, all the rich and comfortable apartments and the huge buildings, took so much time and effort. People put so much effort into building all this and in just one minute or one hour, it all gets destroyed. In so many of these cities, it is unbelievable how much effort people put into these things. They suffered so much to construct all this, then in one day or in one hour, it is all completely destroyed.
The danger of the atomic bomb comes from anger. If there is patience and no anger, this destruction would not happen.