THE THINGS WE MUST NEVER FORGET: LIFE LESSONS FROM SECOND PETER - Sin becomes fatal when it entrenches on our lives and pushes us past the point of feeling the need to repent. Our stubborn, rebellious hearts can so easily be stayed on the sins we wish to commit down the road. The only thing that will keep a single sin from growing into a chain of sins is a humble, repentant hearing of the Word of God.