Missing opportunities causes grief

Nahj al-Balāgha|Volume 1|Book 3|Chapter 118

Book 3, Chapter 118

١١٨. وَقَالَ (عليه ‏السلام): إِضَاعَةُ الْفُرْصَةِ غُصَّةٌ.

118. Amīr al-mu’minīn, peace be upon him, said: To miss an opportunity brings about grief.