塞翁失马安知非福

sài wēng shī mǎ ān zhī fēi fúsaiwengshimaanzhifeifu

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
3. also written 塞翁失馬焉知非福|塞翁失马焉知非福

Study it in Yanamino