I won't go as far as to pretend to know what the parent means, but I'm quite sure he didn't mean to say he will know what's Wrong every single time, but that he

I won't go as far as to pretend to know what the parent means, but I'm quite sure he didn't mean to say he will know what's Wrong every single time, but that he just can't willfully commit himself to doing something that goes wildly against his morality.