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I'm already in love with one of his quotes in the book you have recommended which goes like this -

WHO said it could not be done? And what great victories has he to his credit which qualify him to judge others accurately?
– Napoleon Hill.

Yeah! He is one of my most respected author. Reading his books have changed my life a lot.

I know but haven't read his work so much. I hope to learn something great out of it. Let's roll. :)
By the way, have you read The Magic of Thinking Big by David J. Schwartz?