4 Bible Verses about Lunatics

He altered his behavior in their presence. Since he was in their power, he pretended to be insane, making marks on the doors of the gate and letting his saliva run down his beard. Achish said to his servants, "Look at this madman! Why did you bring him to me? Do I have a shortage of fools, that you have brought me this man to display his insanity in front of me? Should this man enter my house?"

While these words were still on the king's lips, a voice came down from heaven: "It is hereby announced to you, King Nebuchadnezzar, that your kingdom has been removed from you! You will be driven from human society, and you will live with the wild animals. You will be fed grass like oxen, and seven periods of time will pass by for you before you understand that the Most High is ruler over human kingdoms and gives them to whomever he wishes." Now in that very moment this pronouncement about Nebuchadnezzar came true. He was driven from human society, he ate grass like oxen, and his body became damp with the dew of the sky, until his hair became long like an eagle's feathers, and his nails like a bird's claws.read more.
But at the end of the appointed time I, Nebuchadnezzar, looked up toward heaven, and my sanity returned to me. I extolled the Most High, and I praised and glorified the one who lives forever. For his authority is an everlasting authority, and his kingdom extends from one generation to the next. All the inhabitants of the earth are regarded as nothing. He does as he wishes with the army of heaven and with those who inhabit the earth. No one slaps his hand and says to him, 'What have you done?' At that time my sanity returned to me. I was restored to the honor of my kingdom, and my splendor returned to me. My ministers and my nobles were seeking me out, and I was reinstated over my kingdom. I became even greater than before.

Many of them were saying, "He is possessed by a demon and has lost his mind! Why do you listen to him?"

As Paul was saying these things in his defense, Festus exclaimed loudly, "You have lost your mind, Paul! Your great learning is driving you insane!"