Interpretation:
God has told us that illness, like smallpox should not exist in this world. God also tells us illness originates from the mind. If we can remove dusts from our minds, we can eliminate illness. God has descended from heaven to teach us how to do this. God has given us the Joyous Service to save the world from illness and suffering. By this Service, we are asking God to help others sweep dusts from their minds.
Heaven's Truths, in Healing the Body 