If you think you can and if you think you cannot, you are right either way. If you think you are deep down in a grave or if you think you are in the midst of abundance you are right too either way. A very difficult task is assigned to you; you may not have the know-how. But if you say "yes, I will do it," you will certainly acquire the knowledge, get the necessary assistance and get it done by yourself. But if you think "oh, this is too much for me" you will never attempt to learn and it will remain always beyond your realm of possibility.
But Sudha put it on the very next day and tried to stand up without outside help. She fell; she tried again. Fell down again. Thousands of attempts followed. At last she could stand on her own! With an indomitable will she tried to walk but failed. Without giving up hope she tried again and again. And at last she could walk! Simple dance steps followed. The complicated ones came after months and years of practice. At last she succeeded and danced in a movie like she used to before. She proved the impossible is possible.
Sudha Chandra was a famous South Indian dancer and movie star. She had a serious accident while still in her youth, and one of her legs had to be amputated. "I will dance like before," she declared. "Impossible," said the doctor. "Impossibility is not a word in my dictionary, " she retorted. The very next day she ordered an artificial leg from one of the best doctors of her times. "Never try to balance on it without a support," the doctors advised her.