Someone had brought information to Nushirvan the just that an enemy of his had been removed from this world by God the most high. He asked: "Hast thou heard anything about his intending to spare me?"

There is no occasion for our rejoicing at a foe’s death
Because our own life will also not last for ever.



Saadi Shirazi

http://www.poemhunter.com/poem/ch-01-manner-of-kings-story-37/