One of the most common causes of failure is the habit of quitting when one is overtaken by temporary defeat.
Napoleon HillYou must master the habit of procrastination and eliminate it from your wake-up. This habit of putting off until tomorrow that which you should have done last week or last year or a score of years ago is gnawing at the very vitals of your being and you can accomplish nothing until you throw it off.
Napoleon HillYou might find it necessary to 'snap' out of your mental inertia, moving slowly at first, then increasing your speed, until you gain complete control over your will. Be persistent no matter how slowly you may, at first, have to move. With persistence will come success.
Napoleon HillYou know, it's not more knowledge, it's not more education, it's not more facts that we need. It's a better use of what we already have that we need to have. You have each and every one of you, within your potential power right now to do a wonderful job in your chosen field - if you would only embrace it and use it.
Napoleon Hill