That, when Our revelations are recited unto him, he saith: Mere fables of the men of old. We shall brand him on the nose. 68:15
Allah assures Muhammad that he is not a madman. 68:2
"Thou [Muhammad] art of a tremendous nature."
What would Muhammad do? 68:4
When our [Allah's] revelations are recited to him, he says: "They are merely old fables." 68:15
We will brand him on the nose. 68:16
When disbelievers hear the Quran, they roll their eyes and say "he [Muhammad] is indeed mad." 68:51