Much of the language of these verses is taken from the prophecy of Joel, chapter 1 and 2. There too God threatens to send a great plague of locusts upon a rebellious people.
The demons of darkness are relentless: propagating false religion, propagating atheism, propagating harmful ideas that ultimately hurt, and turn people’s lives into misery. Their desire is to mislead, to confuse, to lie to, and to bring people down. They assume every right to command attention and to propagate their views, to dominate society, and to claim a place which sets them on the same level as values that have guided humanity for centuries.
The ideas that Satan and his hosts will spread at the very end of time will be so militantly projected. There will be movements in the world promoting all these things – the alternative morality, unbelief and atheism – that are so militant that people will fear them. You can see that now. You can see things which would have been regarded by everyone as abhorrence fifty years ago. Now they are introduced on the public media, and in entertainment, and in every possible sphere of life, and everybody is terrified to raise a word against them, and the press are terrified to oppose it even if they wanted to. Everybody gives it a pass.
How rich is the lot of the believer! How thankful we must be that God has opened our eyes, delivered us from the foolishness of our past lives, and the addictions to the things of this world, and the love of sin, and the love of unbelief. How grateful we should be that our hope is altogether higher in glory, in heaven, and that we have Christ with us.