From early the 1930s on, when Hazur was asked if he had a disciple who had made great progress, he cited Kirpal Singh. In the same years, on inspiration from his master, Kirpal began writing the "Gurmat Siddhant" ("The Philosophy of the Masters"), a two-volume spiritual work, in the Punjabi and Urdu languages. It was published, on Kirpal request, under the name of Hazur Sawan Singh. In the 1960s, it was published in English in five volumes. Ruhani Satsang published a number of books under Kirpal Singh's name that were essentially portions of Gurmat Sidhant.