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राजविद्या राजगुह्यं पवित्रमिदमुत्तमम् ।
प्रत्यक्षावगमं धर्म्यं सुसुखं कर्तुमव्ययम्  ॥

rāja-vidyā rāja-guhyaṃ pavitram-idam-uttamam
pratyakṣāvagamaṃ dharmyaṃ susukhaṃ kartum-avyayam – 9.2

A kingly knowledge, a kingly secret, this is the best purifier, directly experiential, the very law of being, comfortable to practise and imperishable too.