11 Lessons from the Life of Robert S. McNamara

1. Empathize with your enemy 
2. Rationality will not save us 
3. There's something beyond one's self 
4. Maximize efficiency 
5. Proportionality should be a guideline in war 
6. Get the data 
7. Belief and seeing are both often wrong 
8. Be prepared to reexamine your reasoning 
9. In order to do good, you may have to engage in evil 
10. Never say never 
11. You can't change human nature 

from the documentary, "The Fog of War" by Errol Morris