焉知非福一词出自《淮南子·人间训》，常与塞翁失马连用。古时候塞上有一位养马的老翁，有一天他的马不见了，而在一年之后带了一匹小马驹回来，小马驹长大之后老翁的儿子试着去骑，却被马驹甩了下来，摔断了一条腿。之后塞外发动战争，到处都在征兆壮丁作战，老翁的儿子因为残疾而免于一战。老翁的邻居们一连几次都根据眼前事情来判断老翁的遭遇是祸是福，而老翁却有着“焉知非福”的思想，预料到之后事情的好坏。故事流传至今，后人便用焉知非福来比喻一时受到损失不一定是坏事，也许之后会因祸得福。另有同名专辑。
塞翁失马，焉知非福？你可以将你一直没时间看的书看完。
Well, every cloud has a silver lining. Now you can read all those books you haven't had time for.
不过塞翁失马焉知非福，我用空余时间出去探索和体验新的地方，而不是坐在酒店房间上网。
Actually it was a blessing in disguise for me as I used my spare time to go out into the city and explore new places instead of sitting in my hotel room browsing.
昨天脸上刚挨了一巴掌，现在，这些想法看上去有些一厢情愿，但是有时侯塞翁失马，焉知非福？
After yesterday's slap in the face this may sound like wishful thinking, but sometimes bad turns have positive unintended consequences.
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