Not sure where this one originated, but there is much wisdom here:
When things go wrong as they sometimes will;
When the road you’re trudging seems all uphill;
When the funds are low, and the debts are high
And you want to smile, but have to sigh;
When care is pressing you down a bit-
Rest if you must, but do not quit.
Success is failure turned inside out;
The silver tint of the clouds of doubt;
And you can never tell how close you are
It may be near when it seems so far;
So stick to the fight when you’re hardest hit-
It’s when things go wrong that you must not quit.