You never want to confuse activity with accomplishment.
Worry about your character, not your reputation. Your character is who you are, and your reputetion is who people think you re.
You get ideas across better through listening and the pat-on-the-back method than you do with a kick on the pants.
Discipline yourself, and others won't need to.
Be at your best when your best is needed.
Never be disagreeable just because you disagree.