Answered by Sayyidi Habib Umar bin Hafiz (may Allah protect him and benefit us by him)
Do you recommend we read the books of Shaykh `Abd al-Qadir al-Jaylani?
Yes, the Shaykh was one of the greatest knowers of Allah as well as being one of the descendants of the Prophet ﷺ. He has benefited people throughout the world. One of his best known works is al-Futuhat al-Rabbaniyyah, which is a collection of transcripts of his speeches. It has a good effect upon the reader and brings about purification and illumination. Another work of his, al-Ghunyah, is also beneficial but a few parts which are not his work have been added to it.