By “wars and rumors of wars” he refers to the troubles that are coming upon them. They supposed after that war the end would come. But see how he warns them: “But the end is not yet. For nation shall rise against nation, and kingdom against kingdom.” He speaks of the preludes to the troubles of the Jews. “All this is but the beginning of the birth pangs,” that is, of the troubles that will befall them. “Then they will deliver you up to tribulation and put you to death.” This was the season for being candid about what was to come, in order that they might strengthen one another in facing their common miseries. The Gospel of Matthew, Homily