The book was not revealed for a silly showing off purpose , That is why
Quote:“This is the book, in it is guidance for sure without doubt, to those who fear Allah”. (2:2)
“They are invited to the book of Allah to settle their dispute”. (3:23)
“We have sent down to you (O Muhammad) in truth so that you might judge between men as guided by Allah”. (4:105).
“And this is a book which We have revealed as a blessing, so follow it and be righteous, that you may receive mercy”. (6:155).
“A book revealed unto you, so that your heart be not in any difficulty on that account, (so that) with it you may warn (the sinful) and teach the believers”. (7:2).
“This Qur’an is not such as can be produced by other than Allah, on the contrary it is a confirmation of (revelations) that were sent before it, and a full explanation of the book, wherein there is not doubt from the Lord of the worlds”. (10:37)
“And We sent down the book to you for the express purpose that you should make clear to them those things in which they differ, and so that it should be a guide and mercy to those who believe”. (16:64).
“We have revealed for you (O men) a book in which there is a message for you, will you then not understand”. (21:10).
“These are the verses of the book that make things clear”. (26:2).
“... A book which We have sent down unto you with full of blessings so that they may meditate on its signs and that man of understanding may receive admonition”. (38:29).
“Verily We have revealed the book to you in truth for instructing mankind. He that receives guidance benefits his own soul, but he that strays injures his own soul”. (39:41).
