We are indebted to Luke the physician for recording the declared basic purposes of our Lord Jesus for coming to planet earth: to seek and to save the lost (19:10); and to set the earth aflame (12:49). Perhaps we should say that in these two verses we have the motive (to seek and save the lost) and the manner (to set hearts aflame) for His coming. Immediately following His declaration of setting hearts on fire, Jesus said, I have a baptism to be baptized with, and how distressed I am until it is accomplished! (12:50).
