To be responsible, keep your promises to others. To be successful, keep your promises to yourself.
Successful people will always tell you: you can do something. It's the people who have never accomplished anything who will always discourage you from trying to achieve excellent things.
Be hungry for success, hungry to make your mark, hungry to be seen and to be heard and to have an effect. And as you move up and become successful, make sure also to be hungry for helping others.
Whenever you see a successful person, you only see the public glories, never the private sacrifices to reach them.