"Despite being a member of the Naqshbandi order of the Sufis, Sirhindi insists that Sufi experience is inferior to the Sharī‘a, because Sharī‘a “is based on incontrovertible proof, while Sufi experience is a result of fallible speculation only….Any Sufi experience that is rejected by the Sharī‘a is heresy.” Sirhindi denounces all innovations, even so-called good innovations (bid‘a hasanah). He does not approve of certain customs introduced by some Sufi orders, such as music (samā‘), dancing (raqs) singing (naghmah), and ecstatic sessions (wajd, tawājud). Sirhindi also attacked the Shi‘a in a most violent and bitter manner in his Epistle on the Refutation of the Shi‘is, arguing that it was his duty to denounce heretical ideas wherever they appear."