The Meaning of Numbers: The Number 66
The number 66 derives part of its meaning from the Millennium. Isaiah 66 describes this idyllic time (and beyond) when Jesus Christ will rule over the earth. Lasting peace will finally come upon Jerusalem and the world's wealth will flow into her (verses 12 - 13). Anyone who does evil upon the earth will be swiftly dealt with by the Lord and the people shall see his glory (verses 14 - 18).
All the nations on earth will know God and worship him during the Lord's reign which will number 1,000 years (Isaiah 66:19 - 21). The weekly Saturday Sabbath, instituted by God and kept by the early New Testament church, will continue to be observed (verse 23). These Sabbaths include God's annual Feast Days, which will also be celebrated in their seasons.
The book of Isaiah, written from 740 to 686 B.C., is the fifth largest book in the Bible in terms of the number of words. It contains 66 chapters, 1,292 verses and 37,044 words.
Paul and the number sixty-six
Paul, the most influential New Testament Christian, is about 66 years old when he is martyred in Rome in 68 A.D. He receives the death penalty of beheading which befitted his status as a Roman citizen. He perishes under Emperor Nero, likely around May or June, just before Nero commits suicide on June 9.
How is number 66 related to evil?
Judah's King Manasseh, who ruled from 696 to 642 B.C., dies at the age of sixty-six. He was the longest reigning sovereign over either Judah or Israel. He was also one of the most evil rulers over God’s people. He zealously rebuilt pagan altars including placing some of them within Jerusalem's temple (2Kings 21:4 - 5).
Manasseh's indulgence in evil even included burning his sons to death as a sacrifice to his pagan deities (verse 6)! He was known for filling Jerusalem with the blood of countless innocent victims (verse 16).
Additional info on Biblical Meaning of 66
Between 66 and 67 A.D., the Biblical books of 2Peter, Jude and 2Timothy were written.
The only Biblical book with more than 66 chapters in Psalms.
Lamentations 3, 1Kings 8 and Matthew 27 have exactly 66 verses.