When Moses came near the mountain of God at Horeb (which is also named Sinai), God made his presence and will known to Moses through an extraordinary sign  – a bush inflamed with a fierce fire that did not harm or destroy the bush. This burning bush was a sign of God’s presence and power to save his people from destruction. The fire of God’s presence always demonstrates his purifying love and mercy that burns away sin and refashions us in his holiness and righteousness (moral goodness). Just as gold is tested through fire, God tests and purifies his people and fills them with the fire of his love and holiness. The real danger and calamity which Jesus points out is that an unexpected disaster or a sudden death does not give us time to repent of our sins and to prepare ourselves to meet the Judge of heaven and earth. The Book of Job reminds us that misfortune and calamity can befall both the righteous and the unrighteous alike. Jesus gives a clear warning – take responsibility for your actions and moral choices and put sin to death today before it can destroy your heart, mind, soul, and body as well. Unrepentant sin is like a cancer which corrupts us from within. If it is not eliminated through repentance – asking God for forgiveness and for his healing grace – it leads to a spiritual death which is far worse than physical destruction.