Shuddadvaita (Sanskrit: śuddhādvaita "pure non-dualism") is the "purely non-dual" philosophy propounded by Vallabhacharya (1479-1531 CE), the founding philosopher and guru of the Vallabhā sampradāya ("tradition of Vallabh") or Puśtimārg ("The path of grace"), a Hindu Vaishnava tradition focused on the worship of Krishna. Vallabhacharya's pure form (nondualist) philosophy is different from Advaita. The Shrinathji temple at Nathdwara, and compositions of eight poets (aṣṭachap), including Surdas, are central to the worship by the followers of the sect.