If you believe in what you are doing, then let nothing hold you up in your work. Much of the best work of the world has been done against seeming impossibilities. The thing is to get the work done.

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.