One of Christianity's core doctrines is the Biblical canon. "Canon" is a term signifying the principles safeguarding the discovery of God inspired written revelation. The Bible is further known as "the closed canon". This term asserts that "type and shadows" led up to the culmination of The Incarnation of Christ, in whom those "types and shadows" pointed forward to. With the fulfillment of this revelation (the birth, life, death, and resurrection of Christ), and the prophetic books penned by the first century prophets unveiling The New Covenant, the canon has been closed. There can be and will be no more books that find their way into the bible. There are also references in The Book of Daniel, and The Book of Jude, giving credence that revelation has been closed following the ministry of Christ, His Apostles, and their prophetic writings. Religious manuscripts that are dated a long time after their actual events are prime candidates for corruption. We see this in "The Gospel of Judas", a fourth century Gnostic writing. Likewise "The Gospel of Thomas" didn't find its way into our bible because, like Judas' Gospel, it failed to meet canonical requirements. In many cases these books are blasphemous. All the books of the "Biblical Canon" were completed within 37 years after the crucifixion of Jesus, therefore contamination was avoided. No man, or men, ever decided which books belong in the Bible. Instead, the God inspired writings that make up our Bible were discovered by men, not selected by men. These books were discovered by the principles of canonicity, which relates to why the Bible is termed as "the canon, or closed canon." It should be noted that The Roman Church has a number of books in their Bible that were rejected at the Protestant Reformation, and remain rejected. This is something of importance that we should all educate ourselves in