A Leadership Primer by Colin Powell, General, US Army retired.

1. Being responsible sometimes means pissing people off.
2. The day soldiers stop bringing you their problems is the day you have stopped leading them. They have either lost confidence that you can help them or concluded that you do not care. Either case is a failure of leadership.
3. Don't be buffaloed by experts and elites. Expects often possess more data than judgment. Elites can become so inbred that they produce hemophiliacs who bleed to death as soon as they are nicked by the real world.
4. Don't be afraid to challenge the pros, even in their own backyard.
5. Never neglect the details. When everyone's mind is dulled or distracted the leader must be doubly vigilant.
6.You don't know what you can get away with until you try.
7. Keep looking below the surface appearances. Don't shrink from doing so (just) because you might not like what you find.
8. Organization doesn't really accomplish anything. Plans don't accomplish anything either. Theories of management don't much matter. Endeavors succeed or fail because of the people involved. Only by attracting the best people will you accomplish great deeds.
9. Organizational charts and fancy titles count for next to nothing.
10. Never let your ego get so close to your position that when your position goes, your ego goes with it.
11. Fit no sterotypes. Don't chase the latest management fads. The situation dictates which approach best accomplishes the team's mission.
12. Perpetual optimism is a force multiplier.
13. "Powell's Rules for Picking People" Look for intelligence. and most critically, a capacity to anticipate, to see around corners. Also look for loyalty, integrity, a high energy drive, a balanced ego, and the drive to get things done.
14. Great leaders are almost always great simplifers, who can cut through argument, debate and doubt, to offer a solution everybody can understand.
15. Part I: Use the formula P=40 to 70, in which P stands for the probability of success and the numbers indicate the percentage of information acquired.
Part II: Once the information is in the 40 to 70 range, go with your gut.
16.The commander in the field is always right and the rear echelon is wrong, unless proven otherwise.
17.Have fun in your command. Don't always run at a breakneck pace. Take leave when you've earned it.Spend time with your families. Corollary: surround yourself with people who take their work seriously, but not themselves, those who work hard and play hard.
18. Command is lonely.

Leadership is the art of accomplishing more than the science of management says is possible.