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Reference to meditation on the divine light & sound is found even in Vedas:
"May the seeker of Divine knowledge learn its secret from a True Guru, practise (meditation thus learnt) and perceive the divine light and sound within; may such seeker pray to God for getting such an accomplished Guru from whom this secret could be learnt!"
- Yajurveda (Chapter 11, ManDal 3)
Therefore, realising its importance in God-Realisation, Santmat pronounces the nādānusandhāna or surat shabda yoga or the Yoga of Inner Divine Sound as the superlative category of devotion.
