Papal Infallibility is the One True Church's policy that the Pope, as God's representative on Earth, is perfect in every way and does not make mistakes, ever. Much like the Bible, when the Pope does or says something that seems contradictory, it is all part God's Divine Plan and thus it is not for we puny mortals to question. For example, if Pope Benedict says that he knew nothing about the priest sex abuse crisis, then he knew nothing. Nothing at all, and that's that! Why must you make the Baby Jesus cry?