He also wrote numerous letters to the righteous among his brethren—-from Egypt to Damascus, from Damascus to other regions, and even from prison—-a sizeable collection that fills several volumes (1).
On the subjects of ʿulū (divine transcendence), istiwāʾ (divine settling over the Throne), and the ṣifāt khabariyyah (attributes affirmed by revelation), together with the rebuttals linked to these matters against the Jahmiyyah, Qadariyyah, Jabriyyah, and other sects of whim and innovation, he produced material that spans many volumes.
Likewise, regarding the subsidiary questions of jurisprudence and the answers related to them, his writings are so abundant that counting or cataloguing them is exceedingly difficult.
Among his authored works are: a treatise on the supplication (2) of Dhū al-Nūn, contained in a slim volume (3);
and a book that addresses the divine will and power, setting out the definitive position on these issues in light of al-Rāzī’s discussion in al-Maṭālib al-ʿĀliyah (4).