Nahj al-Balāgha

Hadith 1675
governance
٤٨. وَقَالَ (عليه ‏السلام): الظَّفَرُ بالْحَزْمِ، وَالْحَزْمُ بِإِجَالَةِ الرَّأْيِ، وَالرَّأْيُ بِتَحْصِينِ الْأَسْرَارِ.
48. Amīr al-mu’minīn, peace be upon him, said: Victory is by determination; determination is by the turning over of thoughts; and thoughts are formed by guarding secrets.
Source: al-Sharīf al-Raḍī