fire on the earth] See Matthew 10:34. He speaketh here of that effect which the Gospel should produce, not of it self, but by reason of mans corruption and abuse of it. and what will I] That is, though I desire not dissentions, yet I would not for wicked mens sakes that the elect should want the comfort which shall come to them by the publishing of the Gospel. Hereby he stirreth them up to diligence in preaching the Gospel, notwithstanding the tumults which they should see following the same.