Frenemies
"There's nothing worse than a wolf befriending sheep. Avoid false friendship at all costs. If you are good, straightforward, and well meaning it should show in your eyes and not escape notice."
—Marcus Aurelius, Meditations, 11.15
What do you get if you cross friends with enemies? "Frenemies" of course!
Sometimes they are your friend and other times your enemy!
Personally I can't say that I've got any frenemies, or at least not that I am aware of anyway.
This is another meditation that I can't compare to trading unfortunately, although I suppose you could say that if you don't stick to the rules/criteria for your strategies and fail to become immersed in the correct mindset for trading, you could become your own worst enemy!
Food for thought maybe?