Luke 9:39 “And behold, a spirit seizes him, and he suddenly cries out; it convulses him so that he foams at the mouth, and it departs from him with great difficulty, bruising him.”
It has been observed that this boy may have simply had seizures. But, as we know, seizures can also be caused by other problems. It is never a good idea to begin explaining the Bible scientifically, while also using that as an excuse to rewrite it. It is fine to apply science. It is very possible that seizures were involved here. But, that need not require that we negate the existence of the evil spirit, or its role in this malady.
The point here is not that an evil spirit is involved in seizure-type sickness. Instead the point is that it was involved in this case. If we explain away the spirit, we explain away the plain meaning of Scripture. This leads us to a dangerous precedent, where we will try to explain away any word or phrase that we do not like. We must constantly be on guard because, as humans, we tend to be biased.
Heavenly Father, thank You for Your Word. We love You so much and are so glad to have Your Truth available to us. Both general and special revelation show Your amazing handiwork. We praise You for it all! In the Name of the Lord Jesus Christ I pray and praise You, Amen.