50/50

You may be a Magic God, but you are not perfect. Or
rather, you are too perfect and that gives you a troublesome characteristic. You know that
and that is why you have put together this exaggerated plan to free you from that dilemma.”

“...”

“Infinite possibilities sounds good, but that gives you both the possibility of success and
the possibility of failure. I suppose it’s something like matter and antimatter. For
everything, you must hold the possibility for success and the possibility for failure. No
matter how much power you gather, you have a 50/50 chance. If you think of it like
Russian roulette, it’s like taking a shot with three bullets loaded. Let’s be honest, Othinus.
While you possess the power to destroy the world, you also have a fifty percent chance
of losing to a child in a game of rock-paper-scissors. It’s almost a miracle that Kamijou
Touma has lost twice. His misfortune must really be something. But given this condition,
you cannot just wield your full power at random. You want to find a way to control those
possibilities. Wanting to increase your possibilities for victory is natural, but when your
possibilities for failure increase too, you need to find some way of dealing with that. 50/50
is the most troublesome of all.”

-Shinyaku Toaru Majutsu no Index Volume 4 Profound Destruction