Gopala Tapaniya Upanishad — Ashtadasakshari Mantra
क्लीं कृष्णाय गोविन्दाय गोपीजनवल्लभाय स्वाहा
Klīṁ Kṛṣṇāya Govindāya Gopījana-vallabhāya Svāhā
Klim, salutations to Krishna, to Govinda, beloved of the gopis — svaha.
Atharva Veda · Atharva Veda (Vaishnava Upanishad group) · 96 mantras
Gopala Tapaniya Upanishad
Gopāla-tāpanīyopaniṣad
Central theme: The esoteric meaning of Krishna-Gopala — Purva-tapaniya unpacks the Krishna Ashtadasakshari (18-syllable) and Gopala Mantra-raja, Uttara-tapaniya gives the Brahma-Krishna identity
The foundational Upanishadic source for the Gaudiya, Nimbarka, Vallabha, and Pushti sampradayas. The Purva-tapaniya (4 chapters) describes the Gopala-yantra of Vrindavan, unfolds the famous 18-syllable mantra "Klim Krishnaya Govindaya Gopijana-vallabhaya Svaha", and identifies the Gopis as the supreme exemplars of bhakti (the gopis-rasa-leela is not erotic but is the eternal play of jivas with Paramatma). The Uttara-tapaniya (4 chapters) frames the conversation between Brahma and the Gopas: Krishna is Para-Brahman, Vrindavan is the eternal Goloka transposed onto earth, the flute is the call of grace, the Yamuna is the river of consciousness. This Upanishad is the primary scriptural justification cited by Chaitanya Mahaprabhu for treating Krishna (not Vishnu, not Narayana) as Svayam Bhagavan — the original source.
Gopala Tapaniya Upanishad — Ashtadasakshari Mantra
क्लीं कृष्णाय गोविन्दाय गोपीजनवल्लभाय स्वाहा
Klīṁ Kṛṣṇāya Govindāya Gopījana-vallabhāya Svāhā
Klim, salutations to Krishna, to Govinda, beloved of the gopis — svaha.
Krishna is not an avatar — he is the source of all avatars. The flute he plays is the call you have been hearing your whole life.