KAṬHA UPANISHAD · 1.2.9

नैषा तर्केण मतिरापनेया
प्रोक्तान्येनैव सुज्ञानाय प्रेष्ठ ।
यां त्वमापः सत्यधृतिर्बतासि
त्वादृङ्नो भूयान्नचिकेतः प्रष्टा ॥ ९॥

naiṣā tarkeṇa matirāpaneyā
proktānyenaiva sujñānāya preṣṭha ।
yāṃ tvamāpaḥ satyadhṛtirbatāsi
tvādṛṅno bhūyānnaciketaḥ praṣṭā ॥ 9॥

This wisdom is not to be had by reasoning, O beloved Nachiketas; only when told thee by another it brings real knowledge, — the wisdom which thou hast gotten. Truly thou art steadfast in the Truth! Even such a questioner as thou art may I meet with always.

Sri Aurobindo · CWSA 18, p. 110