He did so precisely to help the church understand how it was a righteous judgment of god that he would appoint for them to walk through persecutions and afflictions so his first treatment of the theme of eschatology is not in a chapter in a systematic theology book as precious as those are but as an urgent message right here to people who are being slandered being fired from their jobs beaten being jailed being killed in other words he's writing about the second coming for the sake of Pastors and followers that are now being persecuted. John Piper