Why Read the Bible?

According to St. Thomas Aquinas, we must read the Bible because it uniquely instructs us in divine truth, moves us to virtuous action, and delights us with its spiritual profit, acting as God’s map that guides the soul toward eternal life.
Sacred Scripture – The Book Written by God

After heated controversies, obscure translations, inexplicable mutilations, losses and forgeries, the Work of works, under the maternal custody of the Holy Church, has reached us.
How Did the Bible Come Down To Us?

The originals have not been conserved, nor many of the subsequent copies, of the 73 books of the Bible. Then how did the Word of God contained within them come down to us intact?