2. Reference must constantly be made to the Old Testament.

This rule, which is of importance in order to understand any part of the New Testament, becomes of the highest necessity in any attempt to interpret the Revelation. The writer was evidently a diligent student of the older Scriptures, absorbing their images and emblems until they had become a part of himself. Much in his writings that at first seems obscure becomes plain when we put ourselves in his position and study the Scriptures, which were evidently in his thoughts.

The prophetical books of the Old Testament especially are to be studied. Between the relation in which the older prophets stood to the laws and institutions of Moses and that which the apostles of the New Testament dispensation sustained to the Lord Jesus Christ a strong similarity exists. Neither the one nor the other claimed to be originators or independent discoverers, but rather witnesses to truths already revealed, which they accepted as primary and fundamental facts. Into the clear understanding, indeed, of these they were enabled by divine inspiration to look more deeply than others could, and they were also supernaturally aided to draw them out into great principles, capable of application to human thought and conduct in the shaping of individual and national life and practice. Thus, naturally and by sympathy of condition, the later writers found themselves led into careful and profound study of their predecessors. The prophecies of Daniel and Zechariah deserve to be especially consulted. Written, as they were, at or near the time of the captivity of Judah, they had peculiar interest for one who was himself an exile for the truth. Some of the imagery of the Revelation is drawn from the glowing poetry of Isaiah. And almost the entire Book of Joel has been worked into the Apocalypse.

But of all helps to an understanding of the Revelation the most fruitful is a close and careful comparison with the Book of Ezekiel; especially is this the case in reference to the closing chapters of both. Between the authors of these two works there were striking similarities of character and condition. But a more powerful bond of union is found in the fact that both of them were preëminently prophets of the Holy Spirit, seeming to have reached truer and profounder views of his work in the economy of redemption than any predecessors in their separate dispensations. Isaiah and Paul wrote of Christ and his Church; but if we wish to learn the fullest development of the office of the Holy Ghost we must turn to the pages of Ezekiel and John.

In addition to the Old Testament references, the prophetical discourses of our Lord uttered near the close of his ministry and recorded in the synoptical gospels will throw much light on the Book of Revelation. The omission of these from the gospel of John may be accounted for by the fact that in the Revelation the apostle had made such large use of them. The important prediction of Paul concerning the man of sin, found in 2 Thessalonians ii, must also be compared with those of John.

3. The emblems and symbols of the Revelation must be interpreted by the light of the Jewish Scriptures and ritual.

This, indeed, follows as a corollary form the preceding rule, but is of so much importance as to deserve special mention. Sometimes a word or a figure of speech or the connections of a sentence or a passing allusion to some sacrificial service will afford a clew to what at the time was in the mind of the writer. Inasmuch as he was a Jew, “taught according to the perfect manner of the law of the fathers,” familiar with the Scriptures, traditions, usages, and history of his religion, his interpretation of symbols and emblems would naturally be such as would occur to the mind of a Jew. We must place ourselves as near as possible to his standpoint. Yet, as he was also an inspired apostle of the Lord Jesus Christ, we must be prepared to concede that he read deeper into these mysteries than his fellows did and was able to import into them a richer meaning.

4. Particular attention must be given to the numbers found in the book.

Much that is fanciful and extravagant has, it must be conceded, been written on this subject, and to many persons any discussion of it is distasteful. Yet it is certain, as the Wisdom of Solomon says, that God has “ordered all things in measure and number and weight.” Otherwise there could be no such thing as exact science. Truths lie veiled in figures, for these represent fixed principles and plans in the divine mind. As a general truth, it may be stated that the ideas expressed by numbers, not only in this book, but throughout the Bible, whenever these are used symbolically, are those of fullness, exactness, and perfection, on one hand, or deficiency, incompleteness, and imperfection, on the other.

The numbers which figure most largely in symbolism are seven, twelve, six, and three and a half.