'Demented' in the Bible

The days of punishment have come,The days of retribution have come;Let Israel know this!The prophet is a fool,The inspired man is demented,Because of the grossness of your iniquity,And because your hostility is so great.

So then, if the whole church gathers together and all of you speak in [unknown] tongues, and outsiders or those who are not gifted [in spiritual matters] or unbelievers come in, will they not say that you are out of your mind?