When things go wrong, as they sometimes will; as they sometimes will; when the road you’re trudging seems up hill; when funds are low and debts are high, and you want to smile but you have to sigh; when all is pressing you down a bit; Rest if you want but don’t you quit. Success is failure turned inside out.
The Silver tint on the clouds of doubt; and you can never tell how close you are; it may near when It seems far. So stick to the fight when you’re hardest hit; it’s when things go wrong that you must not quit. By John Greenleaf Whitter
From Pity to Praise 