First of all, I think that a person can only reach his goal only if he keep his belief stay unchanged regardless of what will happen. In other words, the person needs to believe in his ability and the possibility of his goals. It is the bedrock to motivate him. It also provides him with incredible strength to overcome difficulties and make dreams come true. Thomas Edison is famous for his invention of electric bulb. To have this achievement he has failed hundreds of times; only the last time did he make it. He said that after finding all the ways that the bulb doesn't work, he had finally found the right way.