塞翁失馬焉知非福 [－－－马－－－－]

Jyutping coi3 jung1 sat1 maa5 jin1 zi1 fei1 fuk1
Pinyin sài wēng shī mǎ yān zhī fēi fú

Definitions (CC-CEDICT)
  1. the old man lost his mare, but it all turned out for the best (idiom); fig. a blessing in disguise
  2. it's an ill wind that blows nobody any good