Interpretation:
God is going to show the people who we have spread the teachings, guidance in the form of illness, to show them the evil thoughts in their minds. These are the dusts (greed, arogance, self-love, regret and covetousness) that cause us to act when inconvenieces occur in our lives. God is showing them their future based on their thoughts in their minds. When they realize God’s guidance, they can change their future by not acting on their evil thoughts. By this process they can control their future. Remember we reap what we have sowed due to our own hearts.
Heaven's Truth of the Heart, Mind, & Body 