My brother believed in knowing how to defend oneself. Here is an excerpt from his work, Sphere of Influence: An Approach to Self-Defense, in which he discusses the ability to clear your mind and protect yourself against someone who is trying to do you harm.
The mind is a mirror; clean it every day. Clarity is what is set before you. Why it is set there is no more an issue than who put it there. The situation must be dealt with as it is, not as you wish it to be. Your opponent is a great enemy of no man. Do not make a man of him. Wreck the target and make it nothing more than that.
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You can also check out this short video of Miles demonstrating the first set of forms from Wing Chun, the Chinese art of self-defense which he discusses in his book: