Where to Find The Keys to the Code of Revelation
"John claims at the very beginning that the purpose of the book is toreveal things “that must soon take place” (Revelation 1:1) and that God “signified” (KJV, ASV, NKJV, CSB) these things to him, meaning that they were presented not in literal language but in symbolic language that requires understanding the meaning of the symbols used. This means that Revelation is written in a kind of code, and the reader or hearer is challenged to discover the keys to the code, which are found primarily in the Old Testament scriptures." Edwin Reynolds