The "primacy of Peter" doctrine asserts that Jesus gave Peter, and Peter's successors, authority to function as the sole custodians of true Christian teaching—and as Pope Benedict asserted, "This primacy is for all time" (ibid.). Supporters of this doctrine point to one key passage of scripture, in which Jesus said, "you are Peter, and on this rock I will build My church… I will give you the keys of the kingdom of heaven, and whatever you bind on earth will be bound in heaven" (Matthew 16:18–19). A careful study of this passage and other scriptures, however, reveals something very different from what Benedict has in mind.