When you know a piece of news that will wound someone's heart, stay silent and let someone else deliver it.
Nightingale, bring the good news of spring; leave the bad news to the owl.
Explanation: In Persian poetry the owl is a bird of ill omen tied to ruins, while the nightingale sings of spring and joy.
Original · Persian
حکمت شمارهٔ ۲۵
خبری که دانی که دلی بیازارد، تو خاموش تا دیگری بیارد.