Don't Quit:

 When things go wrong, as they sometimes will, When the road you're trudging seems all uphill, When funds are low and debts are high, And you want to smily, but you have to sigh, When care is pressing you down a bit, rest if you must but don't you quit. 

Life is queer with its twists and turns, As every one of us sometimes learns, And many a person turns about, When they might have won had they stuck it out; Don't give up, though the pace seems slow, you may succeed with another blow. 

Success is failure turned inside out, the silver tint of the clouds of doubt.  And you never can tell how close you are, It may be near when it seems afar.  So stick to the fight when you're hardest hit--It's when things seem worst that you mustn't quit!

When I feel hopeless and it seems all effort is not bringing any result I listen to this poem:

It definitely makes the difference. When it talkes about what it means to be whithout hope..and it definitely teaches you that nothing is impossible..and take a break, rest, but then get up, wipe the dust out and start running.