The Prophet (peace be upon him) was sent to address people of every level, from ignorant seventh-century bedouins to those of the highest intellectual and scientific achievements, until the Day of Judgment. No one has yet been able to disprove what he said. Accordingly, after we scrutinize his Traditions and the Quran, we realize that they complement each other in style and content. Moreover, there is no contradiction between them and established scientific knowledge. Ever since the Revelation, billions of people have found in the Quran answers for their intellectual problems, cures for their spiritual diseases, and models for their behaviour in all circumstances.
The enchanting, captivating, and informative words of God's Messenger that so enlightened his Companions intellectually and revived them spiritually have exerted the same influence on countless scholars, scientists, Quranic exegetes, Traditionists, jurists, spiritual guides, and specialists in science and humanities. Such people, the vast majority of whom have been non-Arab, have used the Quran and Sunna as the foundational sources of their academic studies and endeavours.
Even today, his words are enough to cause people to reform themselves and embrace Islam. He acknowledged this as one of God's blessings and, to emphasize it as so, would sometimes say: "I am Muhammad, an unlettered Prophet. No Prophet will come after me. I have been distinguished with conciseness of speech and comprehensiveness of meaning," (Kanz al Ummal) and: "O people, I have been honored with conciseness of speech and giving the final judgment in all matters." (Kanz al Ummal)
"The Messenger of God: Muhammad" - Fethullah Gulen, pp. 96, 97