Law 15
All great leaders since Moses have known that a feared enemy must be crushed completely. (Sometimes they have learned this the hard way.) If one ember is left alight, no matter how dimly it smolders, a fire will eventually break out. More is lost through stopping halfway than through total annihiliation. The enemy will recover, and will seek revenge. Crush him, not only in body but in spirit. –Robert Greene, The 48 Laws of Power (review)