Some fear the number 666 without just cause. Let this verse be just cause for fear.
John 6:66 After this many of his disciples turned back and no longer walked with him.
There should be a reason why those disciples left Jesus. Here is what preceded 666.
John 6:65 And he said, “This is why I told you that no one can come to me unless it is granted him by the Father.”
They realized they were not chosen. So why is this important in context in this present generation?
KJ21 2 Thessalonians 2:3
Let no man deceive you by any means, for that Day shall not come, unless there come a falling away first, and that man of sin be revealed, the son of perdition, (666)
Matthew 24:10-12 English Standard Version
10 And then many will fall away and betray one another and hate one another. 11 And many false prophets will arise and lead many astray. 12 And because lawlessness will be increased, the love of many will grow cold.
If you are chosen, be leary of false prophets and do not be led astray.