I will do in thee that which I have not done - The destruction of Jerusalem by Nebuchadnezzar was one of the greatest calamities that ever fell on any nation or place before; and that by the Romans under Titus exceeded all that has taken place since. These two sackages of that city have no parallel in the history of mankind.
Compare Matthew 24:21. The calamities of the Babylonian were surpassed by the Roman siege, and these again were but a foreshadowing of still more terrible destruction at the last day.