नैषा तर्केण मतिरापनेया
प्रोक्तान्येनैव सुज्ञानाय प्रेष्ठ ।
naiṣā tarkeṇa matir āpaneyā
proktānyenaiva sujñānāya preṣṭha |
(Kaṭha Upaniṣad: 1.2.9)
“O dear one, this understanding [i.e., knowledge of Brahman] is not to be sought with tarka. Only when taught by another [i.e., one who already knows Brahman] does one acquire true knowledge.”