During his stay in Baghdad, he established, by his conduct, that he was truthful and extremely charitable. During his stay, although he had to endure great hardships, by dint of the natural talents and devotion, he very soon became the Master of Quran, Fiqh, Hadith and Arabic literature, with all its connected branches.

He was once teaching Quran and a verse was erad. Several interpretations of the verse citing previous interpretations were quoted. In addition to these interpretations, so many other aspects and meanings of the verse were explained in detail, that Sheikh Jamal-din bin Jowzi, who was amongst the audience and was himself a renowned author of his time, admitted to a companion of his, that he knew of only eleven out of the forty different explanations of the verse given by Hazrat Ghosul Azam.

In 521 Hijri, Hazrat Abu Saeed Mubarik Bin Mokarrimi made over his Madrasa to Saiydina Abdul Qadir, In the beginning, there were only very few students; but soon his fame for learning, piety, inner illumination, veracity, and strict adherence to Shariat spread far and wide and people from all over the world began to flock round him to reap the benefits of his lectures and sermons. Gradually the existing building proved too small for the ever-increasing students, and in 528 AH, adjacent houses had to be acquired. For thirty-three years between 528 and 561, he devoted himself to the cause of Education. He himself taught Muslim Law, commentaries on the Quran, Hadith, Syntax (grammar) and other Islamic subjects. Students from every part of Iraq and all over the Muslim world came to his Madrasa, where they received free education with boarding and lodging provided.

After completing their course of studies, these students either returned to their own countries or went to some other lands in order to spread the knowledge and virtues acquired from the Hazrat. Education thus spread throughout Iraq and other Muslim Countries to achieve Saiyidina’s sole object of the revival of Islam. Most of his students later became famous Saints and Savants of Islam. Among them were Sheikh Ali bin Hiti-a- Qutub of his time – Sheikh Baqir bin Batu, the head of the Autad, Sheikh Shahabuddin Umar Suharwardy the author of the well known book on Sufism, “Awarif-ul-Maarif” and Head of the Suharwardy Order, Sheikh Abdul Hassan the famous preacher of Egypt and very many others.

As a student, when he was engaged in his studies he did not neglect his efforts to attain spiritual perfection. He therefore, often resorted to fasting and would not ask for food from any one, even if he had to go without any meal for days together.