But you don’t have to constantly be battling your fears. You only need to be courageous for 20 seconds at a time.

If you courageously confront fear for 20 seconds every single day, before you know it, you’ll be in a different socio-economic and social situation.

Believe in yourself and apply maximum conviction and dedication to what you are doing. Don't "try", do it. This puts you ahead of the competition.

This applies to your physical body as well. If you are constantly slouched with a frown on your face and arms crossed, that may not serve you well. That kind of posture can come across as defensive, negative or closed minded. A strong, positive, and open posture will make things that much more attainable.

Problems can be interpreted as opportunities to use different resources and find alternatives.

A problem means life is eliminating options and helping you choose how you are going to be successful. In the case of not having money, it may mean you have to learn to do it yourself. 

Napoleon Hill was said to be an advisor to two presidents: Woodrow Wilson and Franklin Delano Roosevelt.
In fact, there’s no evidence whatsoever outside of Hill’s own writings that Hill met President Wilson or President Roosevelt, let alone acted as a trusted advisor to both.

Napoleon Hill’s most infamous claim was that he met and interviewed at length the industrialist Andrew Carnegie in 1908.

Andrew Carnegie's biographer David Nasaw found no evidence of any sort that Carnegie and Hill ever met.