Bhai Mian Jamal, formerly a Muslim, was a dedicated Sikh of the time of Guru Hargobind Sahib. He used to attend the court of Guru Sahib at Amritsar very frequently. Once he asked Guru Sahib how could he obtain peace of mind. Guru Sahib told him that he could achieve peace of mind and self-realisation by reading and understanding Gurbani and by living life accordingly.
(Dr Harjinder Singh Dilgeer)