Salaam.
Change was wrought through the Qur'an.
Change will be wrought through the Qur'an.
The harbingers of change fourteen centuries ago knew very well that Muhammed the Messenger of God gave them no other book than Al Quran.
The harbingers of change then were people well versed in Qur'an, and who believed therein. They were people with integrity of character, charitable disposition, and constancy and consistency, who would join nothing at all with God. (For accurate details see 24:55.)
Any individual or society built on the above moorings is given a comely life in this world.
They are given everlasting bliss in the Hereafter.
Regards,
A. Ismail Sait.