The Great Tribulation

The emphasis in this passage is that when the event of the Abomination of Desolation occurs, danger has reached a peak and you must flee, for this will be followed by tribulation of such nature that nothing prior or anything after would compare. Non-Christians need to heed the warning about what is to come lest they experience it. Christians need to heed John's admonition that those who have their hope fixed on the return of Christ will purify himself.