There is much need to a closer study of the word: especially should Daniel and Revelation have attention as never before in the history of our work. We may have less to say in some lines, in regard to the Roman Power and the Papacy; but we should call attention to what the prophets and apostles have written under inspiration of the Spirit of God. The Holy Spirit has so shaped matters, both in the giving of Prophesy and in the events portrayed, as to teach that the human agent is to be kept out of sight, hid in Christ and that the Lord God of heaven and His Laws are to exalted. Read the Book of Daniel. Call up, point by point, the history of the kingdoms there represented. Behold statesmen, councils, powerful armies, and see how God wrought to abase the pride of men, and lay human glory in the dust....

So necessary it is that these two books be studied together is seen by the fact that the  book of Daniel is symbolized in the book of Revelation as "a little book open" Daniel Had been told to seal up his book(after being written) until the "time of the end" - 1798. John specifically told not to seal his book of Revelation, and no other book of the bible was ever closed up or sealed.) But John saw that the book of Daniel would be opened. In 1798, this historically happened. Gods' people saw the fulfillment of the 1260 day prophecy of Daniel 8:14. Proof that the little book is indeed the book of Daniel is seen in the fact that it is only after John "eats" this once closed (but now Open) little book, that all the symbols and imagery from the book of Daniel explode into the book of Revelation-even those at same time periods!