The one Church Jesus founded. It was to the leaders of that one Church that Jesus promised "The Holy Spirit will guide you into all truth", and "Whatsoever you bind upon Earth is bound in Heaven", and "He who hears you hears Me". The bishops of that one Church, at the direction of the Pope, compiled the Bible from its own writings (and early Jewish writings) under the guidance of the Holy Spirit, and declares as binging truth that these 73 texts are the inspired Word of God. And that one Church is the sole authoritative interpreter of its own writings and its own book. Which is why that one Church remains one in belief, one in teaching, one in worship, one in biblical understanding throughout the world after 2,000 years, while those who have defected from God's Church and attempted to find truth in "the Bible alone" have fragmented into 6,000+ conflicting denominations who can't agree with one another about the meaning of a single verse of the Bible, in just a few hundred years. And that doesn't even include the 20,000+ so-called "non-denominational" Protestant churches! Total doctrinal chaos due to inability to correctly interpret the Bible!