If you can keep on trying after three failures in a given undertaking you may consider yourself a 'suspect' as a potential leader in your chosen occupation. If you can keep on trying after a dozen failures the seed of a genius is germinating within your soul.
Napoleon HillA mind ill with negative attitudes is more dangerous than a sick body, for its sickness is always contagious.
Napoleon HillMan's brain may be compared to an electric battery...a group of electric batteries will provide more energy than a single battery.
Napoleon Hill