The Catholic Church teaches that Christ entrusted the preaching of the Gospel to the apostles, who handed it on orally and in writing, and according to the "Catechism of the Catholic Church", "the apostolic preaching, which is expressed in a special way in the inspired books, was to be preserved in a continuous line of succession until the end of time. "Sacred Tradition and Sacred Scripture make up a single sacred deposit of the Word of God in which, as in a mirror, the pilgrim Church contemplates God, the source of all her riches." For the Eastern Orthodox too, "the Holy Bible forms a part of Holy Tradition, but does not lie outside of it. One would be in error to suppose that Scripture and Tradition are two separate and distinct sources of Christian Faith, as some do, since there is, in reality, only one source; and the Holy Bible exists and found its formulation within Tradition".