美國社會心理學家費斯汀格（Festinger）有一個很出名的判斷，被人們稱為“費斯汀格法則”：生活中的10％是由發生在你身上的事情組成，而另外的90％則是由你對所發生的事情如何反應所決定。換言之，生活中有10%的事情是我們無法掌控的，而另外的90%卻是我們能掌控的。
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費斯汀格在書中舉了這樣一個例子。
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卡斯丁早上起床后洗漱時，隨手將自己高檔手表放在洗漱臺邊，妻子怕被水淋濕了，就隨手拿過去放在餐桌上。兒子起床后到餐桌上拿面包時，不小心將手表碰到地上摔壞了。卡斯丁疼愛手表，就照兒子的屁股揍了一頓。然后黑著臉罵了妻子一通。妻子不服氣，說是怕水把手表打濕?？ㄋ苟≌f他的手表是防水的。于是二人猛烈地斗嘴起來。一氣之下卡斯丁早餐也沒有吃，直接開車去了公司，快到公司時突然記起忘了拿公文包，又立刻轉回家?？墒羌抑袥]人，妻子上班去了，兒子上學去了，卡斯丁鑰匙留在公文包里，他進不了門，只好打電話向妻子要鑰匙。妻子慌慌張張地往家趕時，撞翻了路邊水果攤，攤主拉住她不讓她走，要她賠償，她不得不賠了一筆錢才擺脫。待拿到公文包后，卡斯丁已遲到了15分鐘，挨了上司一頓嚴厲批評，卡斯丁的心情壞到了極點。下班前又因一件小事，跟同事吵了一架。妻子也因早退被扣除當月全勤獎，兒子這天參加棒球賽，原本奪冠有望，卻因心情不好發揮不佳，第一局就被淘汰了。
在這個事例中，手表摔壞是其中的10%，后面一系列事情就是另外的90%。
都是由于當事人沒有很好地掌控那90%，才導致了這一天成為“鬧心的一天”。試想，卡斯丁在那10%產生后，假如換一種反應。比如，他撫慰兒子：“不要緊，兒子，手表摔壞了沒事，我拿去修修就好了?！边@樣兒子高興，妻子也高興，他本身心情也好，那么隨后的一切就不會發生了。
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可見，你控制不了前面的10％，但完全可以通過你的心態與行為決定剩余的90％。
在現實生活中，常聽人抱怨：我怎么就這么不走運呢，每天總有一些倒霉的事纏著我，怎樣就不讓我消停一下有個好心情呢，誰能幫幫我？
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這都是一個心態問題。其實能幫助自己的不是他人，而是自己。倘若了解并能熟練運用“費斯汀格法則”處事，一切問題就迎刃而解了。
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