mark 13:20 And except that the Lord had shortened those days, no flesh should be saved: but for the elect's sake, whom he hath chosen, he hath shortened the days. - Free Bible Online

      20. And except that the Lord had shortened those days, no flesh--that is, no human life.
      should be saved: but for the elect's sake, whom he hath chosen, he hath shortened the days--But for this merciful "shortening," brought about by a remarkable concurrence of causes, the whole nation would have perished, in which there yet remained a remnant to be afterwards gathered out. This portion of the prophecy closes, in Luke, with the following vivid and important glance at the subsequent fortunes of the chosen people: "And they shall fall by the sword, and shall be led away captive into all nations: and Jerusalem shall be trodden down of the Gentiles, until the times of the Gentiles be fulfilled" (Lu 21:24). The language as well as the idea of this remarkable statement is taken from Da 8:10, 13. What, then, is its import here? It implies, first, that a time is coming when Jerusalem shall cease to be "trodden down of the Gentiles"; which it was then by pagan, and since and till now is by Mohammedan unbelievers: and next, it implies that the period when this treading down of Jerusalem by the Gentiles is to cease will be when "the times of the Gentiles are fulfilled" or "completed." But what does this mean? We may gather the meaning of it from Ro 11:1-36 in which the divine purposes and procedure towards the chosen people from first to last are treated in detail. In Ro 11:25 these words of our Lord are thus reproduced: "For I would not, brethren, that ye should be ignorant of this mystery, lest ye should be wise in your own conceits; that blindness in part is happened to Israel, until the fulness of the Gentiles be come in." See the exposition of that verse, from which it will appear that "till the fulness of the Gentiles be come in"--or, in our Lord's phraseology, "till the times of the Gentiles be fulfilled"--does not mean "till the general conversion of the world to Christ," but "till the Gentiles have had their full time of that place in the Church which the Jews had before them." After that period of Gentilism, as before of Judaism, "Jerusalem" and Israel, no longer "trodden down by the Gentiles," but "grafted into their own olive tree," shall constitute, with the believing Gentiles, one Church of God, and fill the whole earth. What a bright vista does this open up!

JFB.