4:24 lunatick. There is a definite difference between demon possession and lunacy (or mental illness, as it is called today). Modern naturalists deny the existence of demons, attributing so-called demon possession to some form of psychological disturbance. The Bible recognizes both types of problems, however, and so did Jesus. Furthermore, He was able with just a word to cast out demons and also to cure those who were “lunatics” (a generic term that could apply to any type of mental sickness), as well as “all manner of disease.” This was a shadow of His coming eternal kingdom, when there will be no more pain or sickness (Revelation 21:4-5).