Defeat the Defeat before Defeat Defeats you.... 
   there are some situations where we feel like there is no way out and we left trying by giving excuses. We all know about the story of the fox in which he tries to eat grapes but he didn't able to get them, so he left by saying grapes are sour.
  but are those grapes were really sour, no one knows because fox didn't tastes them, its just an excuse to satisfy himself.
what if he keep on trying and finally gets success...???
if this happened than fox will be more happy and satisfied that he eat grapes by his hard work, and even if there are some sour grapes that will be more sweet for fox because of his hard work.
So like this only if we set a target we must achieve it, it doesn't matter how much pain we got while achieving it but the happiness after reaching that can't be expressed.

and again after reaching your goal don't stop, aim high, because "Sitaro k aage jaha aur bhi hai".