There always comes, I think, a sort of peak in suffering at which either you win over your pain or your pain wins over you, according as to whether you can, or cannot, call up that extra ounce of endurance that helps you to break through the circle of yourself and do the hitherto impossible. That extra ounce carries you through 'le dernier quart d' heure.' Psychologist have a name for it, I believe. Christians call it the Grace of God.