Some anecdotes recorded in the Janam Sakhis also help explain gurmat principles. A systematic exposition of gurmat principles was for the first time undertaken by Bhai Gurdas (d. 1636), who in his Varan expatiated upon terms such as gurmukh, one attuned to the Gurus' teaching, sangat, fellowship of the holy, and seva, humble acts of service in the cause of the community and of fellow men in general, besides evolving a framework for the exegetics of gurbani. The process of exposition, continued by men of learning such as Baba Miharban (1581–1640), Bhai Mani Singh (d.1737) and Bhai Santokh Singh (1787–1843) and by the writers of Rahitnama literature reached its culmination in the Singh Sabha movement which produced interpreters of the calibre of Bhai Kahn Singh (1861–1938), Bhai Vir Singh (1872–1957) and Bhai Jodh Singh (1882 1981). Above extract from www.atammargonline.org  Note: gurmat does not believe in a cycle of birth and death after death, and gurmat does not believe in any heaven and hell after death. Gurmat has a mission to make this world heaven.