Papal Infallibility

Papal infallibility means that under certain conditions the Roman Pontiff (the Pope) cannot err when teaching about faith or morals.   This is called speaking ex cathedra and its conditions include:

Whether any ex cathedra statements exist is debatable. The Immaculate Conception and the Assumption have been cited as ex cathedra statements. Regardless, the Church attempted to cover this nonsense with Canon Law 749 § 3, which states:

No doctrine is understood as defined infallibly unless this is manifestly evident.

To be true, a doctrine must first be declared infallible before its infallibility is manifestly evident, which is circular reasoning.