You need formidable enemies to keep you sharp; provoke them to whack away at each other
The first part comes from Friedrich Nietzsche, who said: “We need formidable enemies to keep us sharp.”
Nietzsche said you should choose your enemies with care; that an enemy is quite a positive and valuable influence in life, and that you very rarely get on without a few good enemies to spur you on and keep you stirred up.
The second part also comes from Nietzsche: “The best weapon against an enemy is another enemy.”
The reason the CIA armed Iraq’s Saddam Hussein was because it knew Saddam would barge into Iran. For eight years thereafter, both countries whacked the stuffing out of each other.