49. I am come to send fire on the earth. From these concluding words it may easily be inferred, that this was one of Christ’s latest discourses, and is not related by Luke at the proper place. But the meaning is, that Christ has introduced into the world the utmost confusion, as if he had intended to mingle heaven and earth. The gospel is metaphorically compared to fire, because it violently changes the face of things. The disciples having falsely imagined that, while they were at ease and asleep, the kingdom of God would come, Christ declares, on the contrary, that there must first be a dreadful conflagration to kindle the world. And as some beginnings of it were even then making their appearance, Christ encourages the disciples by this very consideration, that they already feel the power of the gospel. “When great commotions,” says he, “shall already begin to kindle, this is so far from being a reason why you should tremble, that it is rather a ground of strong confidence; and, for my own part, I rejoice that this fruit of my labors is visible.” In like manner, all the ministers of the gospel ought to apply this to themselves, that, when there are troubles in the world, they may be more diligently employed in their duty. It is proper to observe, also, that the same fire of doctrine, when it burns on all sides, consumes chaff and straw, but purifies silver and gold.