People agree that he changed the world forever, by himself, in so many great magnificent ways, peace be upon him. But then they say he was "highly intelligent". I am sorry, but no. For someone to change the course of history like that, he must be helped and aided by God Almighty Who created the universes and the worlds. People must acknowledge he is a divine man of God, a holy prophet of God, the last of all prophets. Anything else is pure shameless nonsense.
"Glorified (and Exalted) [be He above all that (evil) they associate with Hirn] Who took His servant (Muhammad) for a journey by night from AI-Masjid-al-Haram (at Makkah) to AI-Masjid-al-Aqsa (in Jerusalem), the neighbourhood whereof We have blessed, in order that We might show him (Muhammad) of Our Ayat (proofs, evidences, lessons, signs, etc.). Verily, He is the All-Hearer, the All-Seer." (The Qur'an, 17:1).
"Glorified (and Exalted) [be He above all that (evil) they associate with Hirn] Who took His servant (Muhammad) for a journey by night from AI-Masjid-al-Haram (at Makkah) to AI-Masjid-al-Aqsa (in Jerusalem), the neighbourhood whereof We have blessed, in order that We might show him (Muhammad) of Our Ayat (proofs, evidences, lessons, signs, etc.). Verily, He is the All-Hearer, the All-Seer." (The Qur'an, 17:1).