Sikhism Guru are often synonymous in "Gurbani" (Sikh writings). There is one primary scripture for the Sikhs: the Gurū Granth Sāhib. It is sometimes synonymously referred to as the Ādi Granth. Chronologically, however, the Ādi Granth – literally, "The First Volume", refers to the version of the scripture created by Guru Arjan in 1604. The Gurū Granth Sāhib is the final expanded version of the scripture compiled by Guru Gobind Singh. While the Guru Granth Sahib is an unquestioned scripture in Sikhism, another important religious text, the Dasam Granth, does not enjoy universal consensus, and is considered a secondary scripture by
Adi Shankara ("Bhāṣya"), original philosophical expositions ("Prakaraṇa grantha") and poetry ("Stotra"). However most of these are not authentic works of Adi Shankara and are likely to be works of his admirers or scholars whose name was also Shankaracharya. Piantelli has published a complete list of works attributed to Adi Sankara, along with issues of authenticity for most. Adi Shankara is most known for his systematic reviews and commentaries ("Bhasyas") on ancient Indian texts. Shankara's masterpiece of commentary is the "Brahmasutrabhasya" (literally, commentary on Brahma Sutra), a fundamental text of the Vedanta school of Hinduism. His commentaries on ten Mukhya (principal) Upanishads are