Idolatry formless ("nirguni") and with form ("saguni"), as stated in Adi Granth 287. Sikhism condemns worshipping images or statues as if it were God, but have historically challenged the iconoclastic policies and hindu temple destruction activities of Islamic rulers in India. Sikhs house their scripture and revere the Guru Granth Sahib as the final Guru of Sikhism. It is installed in Sikh "Gurdwara" (temple), many Sikhs bow or prostrate before it on entering the temple. Guru Granth Sahib is ritually installed every morning, and put to bed at night in many "Gurdwaras". Africa has numerous ethnic groups, and their diverse religious
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