In think and grow rich napoleon hill eludes to a secret which is mentioned in every chapter but never outright highlighted he says that when you discover this secret hidden in every chapter of the book it will click within your brain and life will never be the same well ive cracked this hidden secret in think and grow rich my theory. The secret hill claims that a secret to infinite riches was passed onto him by andrew carnegie during their first meeting the steel magnate gave hill the idea for writing think and grow rich. The big secret of think and grow rich is in every one of the 13 principles of success in the book however the secret is not any of the 13 the secret is well hidden because it is described . Think and grow rich actually grows with you as you grow the reason that this is good news is that all you need to do now is focus more on your secret technique the truth is that all of the chapters techniques in think and grow rich are immensely powerful they are techniques or ways of thinking which are used by the super rich and successful people in life