See also: 塞翁失马，焉知非福
Every cloud has a silver lining. / A setback may turn out to be a blessing in disguise. where; how to know; to be aware(be) not; wrong; blame; Africagood fortune; happiness; luck; Fujian province (abbrev); surname trad. (塞翁失馬，焉知非福) 塞翁失馬 ， 焉 知 非 福 simp. (塞翁失马，焉知非福) 塞翁失马 ， 焉 知 非 福 Literally: “When the old man from the frontier lost his horse, how could one have known that it would not be fortuitous?”.
From a tale in Huai Nan Zi: