नैमिषोपाख्यानं नाम तृतीयोऽध्यायः
Naimisharanya episode Chapter 3
Lord 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, and in Vidyeshwara Samhita, Chapter 3, shloka 10.