Most people don't manage to the utmost of their ability because they don't want to.
Never ignore a gut feeling, but never believe that it's enough.
Think before you act: it's not your money.
Either an executive can do his job or he can't.
If sophisticated calculations are needed to justify an action, don't do it.
The difference between management and administration (which is what bureaucrats used to do exclusively) is the difference between choice and rigidity.