After the vision, Daniel studied anew the prophecies of Jeremiah. They were very plain, so plain that he understood by these testimonies recorded in books.
Ultimately, at the end of time, only one thing will matter, and that is going to be God and what we have done for others in His name. We have devalued an understanding of the Bible, placing more value on books, people, and academic degrees. We must seek an understanding of Jesus at the loss of all things.