GURMAT SUDHAKAR (lit. Sikh principles explained and illustrated : Sudhdkar= the moon, i.e. the illuminator) is an anthology by Bhai Kahn Singh, of Nabha, of excerpts from old Sikh historical texts and manuals of stipulated conduct. The work, first published in 1899, is divided into sixteen chapters. The opening chapter comprises verses from Guru Gobind Singh, the second from Bhai Gurdas and the third passages from the Janam Sakhi of Bhai Bala. The fourth chapter is culled from Gurbilds Chhevin PdtshdJu. Chapters five is based on Var 1 from Bhai Gurdas.
Chapter six repeats the commentary on Var XI of Bhai Gurdas. Chapters seven and eight contain the sayings of Bhai Nand Lal and of Bhai Desa Singh. The ninth chapter summarizes the book Prem Surname.. Chapters ten and eleven present sayings from the Rahilndmd of Bhai Chaupa Singh and the sayings of Bhai Daya Singh. Chapter twelve contains verses from Sri Gur Sob/id of Sainapati, poet contemporary of Guru Gobind Singh. Chapter thirteen offers excerpts from the famous historical text, the Panth Prakash.
Chapters fourteen and fifteen consist of sayings from Guru Gobind Singh and chapter sixteen reproduces verses from Guru Ndnak Prakash and Sri Gur Pratdp Suraj Granth. These extracts from old Sikh sources are heavily annotated. F^ach work is appropriately introduced at the beginning of each chapter. The book remained out of print for many years until it was reprinted in recent years (1970) by the Languages Department, Punjab.