Jude reminds the church that heresy and those who have fallen away should not come as a shock. The times we live in should not come as a shock. Where there is faithlessness there will be persecution and there will be those who do evil. This should not thwart us in our mission to preach the Gospel, in our love for others, our love for Christ or in our own salvation. Jesus has sealed our redemption. So we can go to war, dive into the lives of others without ever fearing that we will lose what Jesus has secured.