To one of his officers
Nahj al-Balāgha|Volume 1|Book 2|Chapter 41
فَضَحِّ رُوَيْداً، فَكَأنَّكَ قَدْ بَلَغَتَ الْمَدَى، وَدُفِنْتَ تَحْتَ الثَّرَى، وَعُرِضَتْ عَلَيْكَ أَعْمَالُكَ بِالْـمَحَلِّ الَّذِي يُنَادِي الظَّالِمُ فِيهِ بِالْحَسْرَةِ، وَيَتَمَنَّى الْمُضَيِّعُ فِيهِ الرَّجْعَةَ، ﴿وَلَاتَ حِينَ مَنَاصٍ﴾.
Mind yourself and consider for a while as though you had reached the end of life and had been buried under the earth. Then your actions will be presented before you in the place where the oppressor cries “Alas” while he who wasted his life yearns for return (to the world), but time was none to escape. (Qur’ān, 38:3)