The Devil in the Details

(Mat 24:21)  For then shall be great tribulation, such as was not since the beginning of the world to this time, no, nor ever shall be.
(Mat 24:22)  And except those days should be shortened, there should no flesh be saved: but for the elect's sake those days shall be shortened.
(Mat 24:23)  Then if any man shall say unto you, Lo, here is Messiah, or there; believe it not.
(Mat 24:24)  For there shall arise false Messiahs, and false prophets, and shall shew great signs and wonders; insomuch that, if it were possible, they shall deceive the very elect.