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Unlike most of the other chapter titles in this book, this one might not be self-explanatory. What is clarity? Clarity is freedom from unpleasant thoughts, emotions, and states of consciousness. Really, it is freedom pure and simple, but for the purposes of this book, it is the freedom to think, and developing that is a crucial branch of the mental arts.
You can't think well if you are angry, depressed, or frightened, or if your mind is cluttered with thoughts. Most computers' hard drives need to be defragmented periodically. Your mind is no different in this respect.