in verses 6.14 through 6.20 discusses Deva (God), interchangeably with Brahman-Atman, and its importance in achieving moksha (liberation, freedom). The text asserts that Deva is the light of everything, and He is the "one swan" of the universe. It is He who is self-made, the supreme spirit, the quality in everything, the consciousness of conscious, the master of primeval matter and of the spirit (individual Self), the cause of transmigration of the Self, and it is his knowledge that leads to deliverance and release from all sorrow, misery, bondage and fear. It is impossible to end sorrow, confusion and consequences of evil, without knowing this joyful, blissful Deva, asserts the sixth chapter of the Shvetashvatara Upanishad. It is to this Deva (divine Self) that, states the text, "I go, being desirous of liberation, for refuge and shelter". Reception Ancient and medieval Indian scholars left many Bhasya (review, commentary) on Shvetashvatara Upanishad. These include those attributed to Adi Shankara, Vijnanatma, Shankarananda and Narayana Tirtha. However, given the nature of open scholarship in Indian traditions, it is unclear if some of these commentaries are exclusive works of a single author, or are they partially or completely the work of another later scholar. For example, the style, the inconsistencies, the citation method, the colophons in the commentary on Shvetashvatara Upanishad as it survives in modern form, and attributed to Shankara, makes it doubtful that it was written in the surviving form by Shankara. Rather, most scholars consider it likely that the Shvetashvatara commentary attributed to Shankara was remodeled and interpolated by one or more later authors. Chakravarti calls the Shvetashvatara Upanishad as the earliest textual exposition of a systematic philosophy of Shaivism. Flood states that it elevated Rudra to the status of Īśa ("Lord"), a god with cosmological functions such as those later attributed to Shiva. Epilogue's loving devotion to God debate The last of three epilogue verses of the Shvetashvatara Upanishad, 6.23, uses the word Bhakti as follows, This verse is notable for the use of the word Bhakti, and has been widely cited as among the earliest mentions of "the love of God". Scholars have debated whether this phrase is authentic or later insertion into the Upanishad, and whether the terms "Bhakti" and "God" meant the same in this ancient text as they do in the modern era Bhakti traditions found in India. Max Muller states that the word Bhakti appears