There are evil spirits in the world. These evil spirits are responsible for the evil things happening in the world. They influence men to do what is evil. They cause problems and afflict people with tribulations.
These evil spirits have the ability to touch humans. We should understand that evil spirits are fallen angels. As angels, they can exist in physical forms. They can take on physical bodies. So, they can touch people physically.
The people who fall victim for the afflictions of evil spirits are those who are not following God. Anyone who does not live his life in obedience to God's commandments will be afflicted by these evil spirits without any restrain.
To be free from the torments of evil spirits, we must accept the ways of God. We must obey God's Word. Those kinds of people are the children of God which the evil one cannot touch.