To prove the truthfulness of Islam and to repudiate false charges leveled against it, he started writing articles in Muslim magazines in 1872. These articles were very much appreciated by the public. It also brought him instant fame because he presented such compelling arguments in support of Islam that no one could refute these.
After a while he started compiling his magnum opus book Braheene Ahmadiyya (Proofs of the Ahmadiyya) in which he presented 300 bright & conclusive arguments for the truthfulness of the Holy Quran and the Holy Prophet Muhammad, peace and blessings of Allah be on him. The first volume of this monumental work was published in 1880, second volume in 1881, third in 1882, fourth in 1884 and fifth in 1905.
The book was a knock out; everybody was convinced of author’s penetrating insight and towering intellectual status. He was hailed as the best of divines, pride of the Muslims of India, valiant defender of Islam. Muslims in India were exuberant, one of the scholars, Maulavi Muhammad Hussain wrote a 200-page review in the course of which he observed:
“In our opinion this book stands unique from the viewpoint of the modern age, the like of which has not been written in the history of Islam. ” (Ishaat al-Sunna Vol 7, No 6)
This is a mere specimen of the opinions held by Muslims about this book. He offered a cash prize of 10,000 rupees to any non-Muslim who could write a similar book to refute the arguments given in the book, but no one dared to write one.
While he was writing this book in 1882, through a revelation he was appointed a Mamoor mina Allah, commissioned by God Almighty. Christian missionaries, Hindu pundits, & Muslim divines, all of them became his virulent opponents. They plotted all kinds of things to discredit him but no one succeeded.