Invisible world of demons

Many people, hearing something about the devil and his tricks, take it for a fairy tale. But no matter what people say or think about the devil, he actually exists, this is undeniable. According to one French writer, the greatest victory of the devil was that he managed to convince people that he does not exist.
The Holy Scripture testifies to the real existence of the devil and demons, the experience of the spiritual life of millions of believers, numerous manifestations of demons to people in all times, including our days. It is difficult for a person to imagine how fierce and cunning fallen spirits are, how restless and inventive they are in tempting and sowing all kinds of evil.
Unbelievers and sinners are the material, the army that the devil uses to spread temptations and evil in human society and establish his kingdom of darkness. His kingdom, like a raging sea, surrounds us from all sides and threatens our salvation.