There's no committee that says, 'This is the type of person who can change the world - and you can't.' Realizing that anyone can do it is the first step. The next step is figuring out how you're going to do it.
One should guard against preaching to young people success in the customary form as the main aim in life. The most important motive for work in school and in life is pleasure in work, pleasure in its result, and the knowledge of the value of the result to the community.