The Guts Theory in Chinese / Japanese...

根性論 is a Japanese title that refers to the belief that where there's a will, there's a way.

Another way to translate this is “The Guts Theory” or “The Doctrine of Will-Power.” Maybe breaking down the meaning of the characters will help clarify this:
根性 = will-power; guts; temper; nature; spirit; nature and character; the nature of the powers of any sense.
論 = theory; doctrine; treatises on dogma, philosophy, discipline, etc.