The Gospel lesson for today contains two parts. The first is a warning to those pious Christians who should live to see the destruction of Jerusalem, in order that they might know it beforehand and be enabled to escape from the calamity.
The other is a warning that pertains especially to these last times in which we live, inasmuch as terrible heresies will be introduced, in order that we may be prepared, may hold to the true doctrine, and beware of false prophets. Both of these warnings are necessary and in season, therefore we will study them with all diligence.
Though the first has reference to the time of the destruction of Jerusalem, fifteen hundred years ago, we may still derive from it the wholesome and comfortable doctrine that we should learn to love and honor the Word of God, and to live according to it, especially as God in such great wrath has punished the rejection of His Word in His own people. (Luther’s House Postil, Sermon for the Twenty-Fifth Sunday after Trinity, Volume 3, p. 892-893).