BṚHADĀRAṆYAKA UPANISHAD · 4.4.21

तम् एव धीरो विज्ञाय प्रज्ञां कुर्वीत ब्राह्मणः ।
नानुध्यायाद् बहूञ् छब्दान् वाचो विग्लापनं हि तद् इति ॥

tam eva dhīro vijñāya prajñāṃ kurvīta brāhmaṇaḥ ।
nānudhyāyād bahūñ chabdān vāco viglāpanaṃ hi tad iti ॥

'Let a wise Brâhmana, after he has discovered him, practise wisdom. Let him not seek after many words, for that is mere weariness of the tongue.