“The way I see it, is that a puthujjana needs pariyatti and paṭipatti to get to paṭivedha(magga phala, the Sotapanna stage).”
That is right. I mentioned this in the second part of my reply. Both learning AND discipline (with a significant effort) are needed to progress in the mundane eightfold path (i.e., for a puthujjana).
But once one gets to the Sotapanna stage, discipline comes (to an extent) AUTOMATICALLY with the grasping of the Tilakkhana (but he/she still has not craving for sense pleasures). One does not need to think about the bad consequences of such highly immoral actions (births in the apayas). One simply would not be able to do such immoral actions. One does not have think: “If I do this I might be born in the apayas”.
It is sort of like the following. A child sees a red hot iron rod as a beautiful thing and may think about touching it. The child has to keep reminding him/herself that Mom has said not to touch it, because it can burn.
– But an adult knows that it can burn, and would not even think about touching it.