The task is to determine what constitutes authentic tradition. How can we know which traditions are apostolic and which are merely human? The answer is the same as how we know which scriptures are apostolic and which are merely human—by listening to the magisterium or teaching authority of Christ’s Church. Without the Catholic Church’s teaching authority, we would not know with certainty which purported books of Scripture are authentic. If the Church revealed to us the canon of Scripture, it can also reveal to us the "canon of Tradition" by establishing which traditions have been passed down from the apostles. After all, Christ promised that the gates of hell would not prevail against the Church (Matt. 16:18) and the New Testament itself declares the Church to be "the pillar and foundation of the truth" (1 Tim. 3:15).