Orthodoxy, as a rule, makes less appeal to the imagination than heresy, and this holds true of seventeenth-century Sumatran Suiism as of mysticism elsewhere. Some of the works of Shamsu'1-Dīn and Hamzah, the foremost exponents of the heterodox pantheistic mysticism of that time, have been published. al-Rānīrī, as an accomplished polemist, cuts a colourful figure whose Tibyān fī ma'rifat al-adyān has been photographically reproduced. The works of ‘Abd al-Ra'ūf, of Singkel, apart from Rinkes’ thesis and one or two monographs have been comparatively neglected. This neglect is not surprising. His works are largely translations and his favourite subject, the dhikr (recitation), does not arouse such a sjympathetic interest as the metaphysical speculations of the heterodox which find an echo in form as well as substance in the history of Western thought.