Bhai Dargaha Bhandari was a devout Sikh of the time of Guru Hargobind Sahib. Once he visited Guru Sahib and asked, “Is it right to debate while interpreting a hymn”. Guru Sahib explained to him the four types of polemic and told him that reasoning for clarification about a concept or for true knowledge was profitable, else it is exhibition of hypocrisy and vanity.
(Dr Harjinder Singh Dilgeer)