Kenneth Gentry provides an excellent scholarly argument for what has become a minority opinion amongst biblical scholars in the last century regarding the date John wrote Revelation. Although openly admitting it is a minority view, Gentry does provide a list of dozens of scholars, including the great historian Philip Schaff, who argue for an early date for Revelation. While Gentry argues that Revelation was written around 66 AD based on both internal and external, he argues internal evidence should be emphasized more than external since that which is internal is inspired by God. He argues for the early date by appealing to internal evidence such as the theme of Revelation, the temporary expectation of the author, the identity of the sixth king, the integrity of the temple, the role of Nero, Jewish and Christian relations, and the looming Jewish war. He also surveys the external evidence such as Irenaeus, Origen, and Clement of Alexandria to show that there exists strong evidence for an early date and at best, inconclusive evidence for a late date.
It should be noted that this should not be the first book one reads to examine this topic as this work is extremely technical and exhaustive in certain areas. It is vital to have a strong background in church history in general and also toward the time period of the 60s and 90s AD.
Positives:
1. The author never disparages adherents of the late date camp, which tends to be common vice versa. He argues that the late date position must be seriously considered as many brilliant scholars land in that camp.
2. The author includes an average of roughly 80 footnotes per chapter. A large majority of these sources are prime sources including Josephus, Taciticus, Seutonius, Irenaeus, Eusebius, Clement of Alexandria, Origen, Tertulliam, etc.
3. The author includes a section responding to common arguments for the late date such as the role of emperor worship, the state of the seven churches, and the nature of the persecution of Christians.
4. The author provides direct historical evidence for commonly challenged claims from the early date position. For example, he includes a prime source which includes the name of Caesar Nero written in Hebrew which dates to the late 60s AD that would equal 666 in the Hebrew number system.
Negatives:
1. The author could have provided longer explanations for the arguments of the opposing side. The width of his arguments for his position were much longer than his description of the other side. While this is expected in any critical work, Gentry's position would have benefited by lengthening this section
2. The author often presents arguments for an early date which he rejects after presenting them. While he is clear in presenting why he believes these arguments are inadequate, this organization can sometimes be confusing.