Since the early twentieth century, Muslim reformers have been campaigning for a total transformation of the ways in which Islam is imagined in the Malay world. One of the most influential is the author Haji Abdul Malik bin Abdul Karim Amrullah, commonly known as Hamka. In Hamka and Islam, Khairudin Aljunied employs the term "cosmopolitan reform" to describe Hamka's attempt to harmonize the many streams of Islamic and Western thought while posing solutions to the various challenges facing Muslims. Among the major themes Aljunied explores are reason and revelation, moderation and extremism, social justice, the state of women in society, and Sufism in the modern age, as well as the importance of history in reforming the minds of modern Muslims. Aljunied argues that Hamka demonstrated intellectual openness and inclusiveness toward a whole range of thoughts and philosophies to develop his own vocabulary of reform, attesting to Hamka's unique ability to function as a conduit for competing Islamic and secular groups.