Don't think of yourself as indispensable or infallible. As Charles De Gaulle said, the cemeteries of the world are full of indispensable men.
Donald RumsfeldDon't accept the post or stay unless you have an understanding with the President that you're free to tell him what you think "with the bark off" and you have the courage to do it.
Donald RumsfeldDon't automatically obey Presidential directives if you disagree or if you suspect he hasn't considered key aspects of the issue.
Donald RumsfeldWhat is needed [to combat terrorism], in my view, is resolve, not retreat; courage, not concession. Rather than thinking in terms of an exit strategy, focus on a strategy for success.
Donald Rumsfeld