“Napoleon had everything men usually crave – glory, power, riches – yet he said at St Helena: ‘I have never known six happy days in my life’; while Helen Keller – blind, deaf, dumb – declared, ‘I have found life so beautiful.’ If half a century of living has taught me anything at all, it has taught me that ‘Nothing can bring you peace but yourself.’”
Dale Carnegie How to Stop Worrying and Start Living