Striving without regret for unmet goals
Nahj al-Balāgha|Volume 1|Book 3|Chapter 69
٦٩. وَقَالَ (عليه السلام): إِذَا لَمْ يَكُنْ مَا تُرِيدُ فَلَا تُبَلْ مَا كُنْتَ.
69. Amīr al-mu’minīn, peace be upon him, said: If what you aim at does not come about then do not worry as to what you were.