The Necessity of Repentance

Luke 13:1 There were present at that season some that told him of the Galilaeans, whose blood Pilate had mingled with their sacrifices. 2 And Jesus answering said unto them, Suppose ye that these Galilaeans were sinners above all the Galilaeans, because they suffered such things? 3 I tell you, Nay: but, except ye repent, ye shall all likewise perish. 4 Or those eighteen, upon whom the tower in Siloam fell, and slew them, think ye that they were sinners above all men that dwelt in Jerusalem? 5 I tell you, Nay: but, except ye repent, ye shall all likewise perish.