Know Yourself & Enemies

[Sugihide]

So it is said that if you know your enemies and know yourself, you will not be imperiled in a hundred battles; if you do not know your enemies but do know yourself, you will win one and lose one; if you do not know your enemies nor yourself, you will be imperiled in every single battle.
-Sun Tzu -Art of War

Thought it might be helpful to anyone.  

[Dr. Awkward]

"As soon as as you concern yourself with the 'good' and 'bad' of your fellows, you create an opening in your heart for maliciousness to enter. Testing, competing with, and criticizing others weakens and defeats you."
-Morihei Ueshiba. -The Art of Peace

Perhaps more peaceful words will help too?  

[Sugihide]

Well, Art of War deals with human psychology in many fields.  

[Izhe]

sounds interesting. i might want to look that book up