4 Bible Verses about Lunatics

So he changed his behavior {before them} and pretended to be mad {in their presence}. He made scratches on the doors of the gate and let his saliva run down into his beard. Then Achish said to his servants, "Look, you see a madman! Why did you bring him to me? Do I lack madmen that you have brought this one to act like a madman before me? Should this one enter my household?"

[While] the words [were] still in the mouth of the king, a voice from heaven came, [saying], 'To you, King Nebuchadnezzar, [it] is declared that the kingdom has departed from you, and you will be driven away from {human society} and your dwelling [will be] with the animals of the field and they will cause you to graze [the] grass like oxen, and seven times will pass over you, until you acknowledge that the Most High [is] sovereign over the kingdom of humankind and that he gives it to whom he wills.' {Immediately} the word was fulfilled {concerning} Nebuchadnezzar, and he was expelled from {human society} and he ate grass like oxen, and his body was bathed with the dew of heaven until his hair [was] like [the hair of] an eagle and his nails grew like bird's [claws].read more.
"But at the end of {that period}, I, Nebuchadnezzar, lifted up my eyes to heaven, and [then] my reason returned to me; and I blessed the Most High and {the one who lives forever} I praised and I honored. "For his sovereignty [is] [an] everlasting sovereignty, and his kingdom [continues] from generation to generation. And all the dwellers of the earth are regarded as nothing, and he does {according to} his desire in the host of heaven and [among] the dwellers of earth, and there is not [one] who can hold back his hand, or {ask him}, 'What are you doing?' "{At that time} my reason returned to me, and [also] the glory of my kingdom and my majesty and splendor returned to me, and my advisers and my lords searched [me] out, and I was established over my kingdom and abundant greatness was added to me.

And many of them were saying, "He has a demon and is out of his mind! Why do you listen to him?"

And [as] he was saying these things in his defense, Festus said with a loud voice, "You are out of your mind, Paul! [Your] great learning {is driving} you {insane}!"