We who stand on the side-lines of Life see the overwhelmingly large number who go down in defeat, never to rise again. We see the few who take the punishment of defeat as an urge to greater effort. These, fortunately, never learn to accept Life’s reverse gear. But what we do not see, what most of us never suspect of existing, is the silent but irresistible power which comes to the rescue of those who fight on in the face of discouragement. If we speak of this power at all we call it persistence, and let it go at that. One thing we all know, if one does not possess persistence, one does not achieve noteworthy success in any calling.
~ Napoleon Hill, Think & Grow Rich