In today's Gospel reading from Luke 13, Jesus tells the need to repent and to bear fruit to be assured of salvation. So, essentially we have three requirements to fulfill: accepting Christ as our Lord and Savior, repent, and bear fruit. Actually, if we fulfill the first requirement faithfully, the other two will automatically be fulfilled too. But there are Christians who slack off and think that their sins are OK, thus putting off repentance, and easily fall into living a more self-centered life, no longer bearing any fruit for the Lord. Their salvation is now no longer assured. It comes down to following the Lord closely to remain vigilant.