Napoleon Hill's "Think and Grow Rich" is an inspirational self-help book that emphasizes the need to develop one's character and maintain a good outlook on life if one wishes to achieve financial success.
Having a "higher purpose" (or "Ikigai"), which is what motivates you to keep going even when things become tough, following a healthy lifestyle, and not giving up on life are all things that have been shown to increase longevity and improve quality of life.
How to Win Friends and Influence People teaches you a set of working principles that helps you in handling people, make them like you, and agree with your way of thinking.
A subconscious mind is a powerful tool that breathes life into what one feeds to it, which is why it is imperative to give the right feed and harness its power to build the life one aspires for.
The author takes the readers on a journey to his past when an unimaginable accident during high school made him lose the ability to perform even primitive biological activities.