Nahj al-Balāgha

Hadith 1691
intellectsilence
٧١. وَقَالَ (عليه ‏السلام): إِذَا تَمَّ الْعَقْلُ نَقَصَ الْكَلاَمُ.
71. Amīr al-mu’minīn, peace be upon him, said: As intelligence increases, speech decreases. [1]
Source: al-Sharīf al-Raḍī