This little work is an excerpt from Bellarmine's larger treatise On the Roman Pontiff, book 4, which follows after the assertion of what was already universally taught at that time, but not completely understood nor decreed by the Church's solemn magisterium, that the Pope was infallible in his teaching on faith and morals when teaching the whole Church. These chapters then, being 8-14 of that work, follow to test and prove this claim historically,...