The entire Faithful Discreet Slave doctrine rests on 607 B.C. according to Watchtower numerology.
It goes something like this:
607 B.C.E. --- Jerusalem is destroyed by Nebuchadnezzar II
According to measurements made by C.T. Russell of the Great Pyramid in Egypt, 2,520 years after 607 B.C.E. Jesus returns but no one can see him except the followers of C.T. Russell, founder of the International Bible Students Association
607 B.C.E. plus 2,520 years brings us to 1914
According to the Watchtower Society, sometime around 1919 Jesus inspected the spiritual temple and selected C.T. Russell's group as his Faithful Discreet Slave and has been using them since to convey his thoughts and directives to humankind.
Let's see.... they were celebrating Christmas, used the Cross, had no problems with blood transfusions or donations, a few other little items that would get any one of them disfellowshipped nowadays.
It all makes perfect sense when you read the box entitled "1914 Foreseen" on page 105 of the Watchtower publication "Revelation Its Grand Climax At Hand!"
The following are direct quotes from that box on page 105:
"It was in B.C. 606, that God's kingdom ended, the diadem was removed, and all the earth given up to the Gentiles, 2520 years will end in A.D. 1914"* ---- The Three Worlds, published in 1877, page 83.
* Providentially, those Bible students had not realised that there is no zero year between "B.C' and "A.D." Later, when research made it necessary to adjust B.C. 606 to 607 B.C.E., the zero year was also eliminated, so that the prediction held good at "A.D. 1914." --- See "The Truth Shall Make You Free", published by the Watchtower Society in 1943, page 239 (italics mine)
The Watchtower admits research made it necessary to change their date of Nebuchadnezzar's conquest of Jerusalem and the destruction of the first temple from 606 to 607.
The question remains as to why they changed their date from 606 to 607. 1914 has to fit in with 607 B.C.E. for the Watchtower's doctrine to seem valid in the eyes of its followers.
Besides, what further evidence do they have for changing their date other than the fact that C.T. Russelll and the Watchtower Society couldn't add things up right then just like they can't do it now?
Since the Faithful Discreet Slave doctrine is built upon the date of 607 B.C.E. it has to be upheld at all costs. Otherwise the Watchtower's claim to be the voice of God is proven false.
Scholar has never addressed this issue because the Watchtower Society has given no evidence or reason for changing the date from 606 B.C. to 607 B.C.
Honesty "of the so glad to be free from the WT Lies class"