Chapter 9: Rājavidyā-rājaguhya-yoga – Kingly Knowledge, Kingly Secret: Conclusion
ओं तत्सदिति श्रीमद्भगवद्गीतासूपनिषत्सु ब्रह्मविद्यायां योगशास्त्रे श्रीकृष्णार्जुनसंवादे राजविद्याराजगुह्ययोगो नाम नवमोऽध्याय:।
oṃ tat-sad-iti śrīmad-bhagavad-gītāsūpaniṣatsu brahma-vidyāyāṃ
yoga-śāstre śrīkṛṣṇārjuna-saṃvāde
rāja-vidyā-rāja-guhya-yogo nāma navamo’dhyāya:
Om – the symbol of Brahman, tat – that singular Reality (Brahman), sat – the ever abiding presence (Brahman).
Thus ends the ninth chapter entitled Rāja-vidyā-rāja-guhya Yoga, during the Srikrishna-Arjuna dialogue in Śrīmad Bhagavad Gita, constituting Yoga-śāstra, which falls within Brahmavidya as presented in the Vedic Upanishads.