( Story told by Swami Vivekananda )
There are two sorts of courage. One is the courage of facing the cannon. And the other is the courage of spiritual conviction. An Emperor who invaded India was told by his teacher to go and see some of the sages there. After a long search for one, he found a very old man sitting on a block of stone. The Emperor talked with him a little and became very much impressed by his wisdom. He asked the sage to go to his country with him. “No,” said the sage, “I am quite satisfied with my forest here.” Said the Emperor, “I will give you money, position, wealth. I am the Emperor of the world.” “No,” replied the man, “I don’t care for those things.” The Emperor replied, “If you do not go, I will kill you.” The man smiled serenely and said, “That is the most foolish thing you ever said, Emperor. You cannot kill me. Me the sun cannot dry, fire cannot burn, sword cannot kill, for I am the birthless, the deathless, the ever-living omnipotent, omnipresent Spirit.” This is spiritual boldness, while the other is the courage of a lion or a tiger.
In the Mutiny of 1857 there was a Swami, a very great soul, whom a Mohammedan mutineer stabbed severely. The Hindu mutineers caught and brought the man to the Swami, offering to kill him. But the Swami looked up calmly and said, “My brother, thou art He, thou art He!” and expired. This is another instance.
Source: The Complete Works of Swami Vivekananda/Volume 2/Jnana-Yoga/The Real Nature of Man