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In Punjab, the great Guru Nanak (1469–1539 CE), who founded the Sikh faith, was greatly influenced by the Bhakti movement. Sikhism, under Nanak, and the nine Gurus who followed him, the last being Guru Gobind Singh (1666–1708 CE), created a remarkably sublime and powerful monotheistic faith of nirguna bhakti. In clear Vedantic tones, its mul mantar or fundamental prayer—Ik Onkar: There is only one Supreme Being—made a powerful call of universal spiritual appeal. Like Brahman, the Sikh Absolute is nirankar (formless), akal (timeless), karta purakh (the Creator), agam agochar (incomprehensible and invisible) and is Waheguru (wonderous Teacher). The religion emphasised the non-duality of divinity—Ek noor te sab jag upja: From one luminous light the entire universe arose. In this one statement, it pole-vaulted above conventional religious orthodoxies.
Of great importance in the Sikh faith is mehar, kirpa, karam or the Grace of God. Guru Nanak taught that to obtain this, the most important form of worship is bhakti. Guru Arjan, in the Sukhmani Sahib, recommended that true religion is one of loving devotion to God. Selfless devotion and service can lead to Sach Khand or the Realm of Truth, which is the final union with the spirit of God, akin to the Advaita notion of brahmanubhav. Thus, Sikhism considers simran (the meditative remembrance) of God, and japna (chanting or kirtan of God’s name) to be an essential part of religious practice. The singing of the Guru’s hymns as contained in the Guru Granth Sahib—the only divine symbol of worship recognised by Sikhism—is practised through the shabad kirtans. The passages of the Guru Granth Sahib were poetically composed in rhyme, and lent themselves easily to exceptionally soulful musical compositions based on thirty-one ragas of classical music.
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Pavan K. Varma (The Great Hindu Civilisation: Achievement, Neglect, Bias and the Way Forward)