"And We have sent down to you the Book (the Quran) as an exposition of everything, a guidance, a mercy, and glad tidings for those who have submitted themselves (to Allah as Muslims)"
[Al-Nahl 16:89]

" And indeed, We have bestowed upon you seven of al-Mathaani (the seven repeatedly recited verses, i.e. Soorat al-Faatihah) and the Grand Quran. "
[Al-Hijr 15:87]

"And indeed, We have made the Quran easy to understand and remember, then is there any that will remember (or receive admonition)?"
[Al-Qamar 54:40]

Uthman bin Affan (may Allah be pleased with him) narrated that the Prophet (peace be upon him) said, "The most superior among you (Muslims) are those who learn the Quran and teach it."
[Bukhari: Book 61: Hadith 546]

"Verily, We have sent down to you (O Muhammad) the Book (this Quran) for mankind in truth. So whosoever accepts the guidance, it is only for his ownself; and whosoever goes astray, he goes astray only for his (own) loss. And you (O Muhammad) are not a Wakeel (trustee or disposer of affairs, or guardian) over them"
[Al-Zumar 39:4]