Plague of Locusts

Exodus 10:1-20
The Lord performed so many miraculous signs that you may know that I am the Lord.
How long will you refuse to humble yourself before me?
Pharaoh's officials agreed let the people of Israel go to worship the Lord. Pharaoh said no! have only the men go and worship the Lord.
Moses stretched out his staff over Egypt, and the Lord made an east wind blow across the land all that day and all that night. By morning the wind had brought the locusts; they invade all Egypt and settled down in every area of the country in great numbers. Nothing green remained on tree or plant in all the land of Egypt.
The locust in the internal sense is there meant the falsity which vastates the extremes.  For as before shown, the natural with man is interior and exterior; the falsity which is in the extremes of the natural, being meant by the locust, and the evil therein by the caterpillar(毛毛蟲). As by the locust is meant the falsity which is in the extremes of the natural, therefore it is said that the locust would be brought "into the border, and would cover the surface of the earth; and afterward (verse 14), the locust went up upon the land of Egypt, and rested in all the border of Egypt, and it covered the surface of the whole land. By the border and by the surface" are signified the extremes and ultimates in which the interiors rest, that is, terminate.
Why?
People's heart is harden, so this question will asked "How long will you refuse to humble yourself before the Lord?" Do you not yet realize the xxx is ruined?
Pharaoh to be a king over Egypt, but refuse turn to the Lord after these disaster happened over his land.
Falsity are full and cover this land, but Christian should be a salt, keep the society won't be terminated.
How?
Terminate the falsity and says the truth in this world, it is our job in this world.