Napoleon Hill was an author on motivation, personal development, and success.  Here are some of his thoughts on the power over self:

• We begin to see, therefore, the importance of selecting our environment with the greatest of care, because environment is the mental feeding ground out of which the food that goes into our minds is extracted
• Education comes from within; you get it by struggle and effort and thought
• Fears are nothing more than a state of mind
• If you do not conquer self, you will be conquered by self

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