Everybody in the world is seeking happiness - and there is one sure way to find it. That is by controlling your thoughts. Happiness doesn't depend on outward conditions. It depends on inner conditions.

Born into poverty on a farm in Missouri he was the author of How to Win Friends and Influence People (1936) a massive bestseller that remains popular today. He also wrote How to Stop Worrying and Start Living (1948) Lincoln the Unknown (1932) and several other books.