There was a man. God came to him in a dream and told: "Push that cliff". The man started to push the cliff. Every day. He tried very hard. And no results. After several years man cried on the God "Why nothing happens? It is not possible! You see the cliff is not moving at all!!!". And God replied "I didnt told you to move that cliff. I told you just push that cliff. I will move that cliff when needed. But look at your self now - how you learned discipline, how you trained your muscles. You now are a lot stronger person."