The wall

Alex went to school by walk. He went to school with his friends. Few of his friends were tall and few were short. Alex was not that tall. There was a wall on the way. His tall friends used to sit on that wall for sometime and chat. Alex tried few times to climb the wall. He could not climb the wall. His friends bullied him for not able to reach the height of the wall. Few months passed by. Alex went to that wall every Sunday and practiced climbing. His height too increased and after few months, he could climb the wall. He felt happy.