The highest truth, which even the mind cannot grasp

नैमिषोपाख्यानं नाम तृतीयोऽध्यायः

 

Naimisharanya episode Chapter 3

 

ब्रह्मोवाच |

 

Brahma said (to the sages)

 

यतो वाचो निवर्तन्ते अप्राप्य मनसा सह |

आनन्दं यस्य वै विद्वान्न बिभेति कुतश्चन || 1 ||

 

That without grasping which speech turns back along with the mind, whose joy,
a knowledgeable person does not fear for any reason.

The first half of this shloka also appears in Taittiriya Upanishad, Chapter 2, shloka 9.