美国社会心理学家费斯汀格（Festinger）有一个很出名的判断，被人们称为“费斯汀格法则”：生活中的10％是由发生在你身上的事情组成，而另外的90％则是由你对所发生的事情如何反应所决定。换言之，生活中有10%的事情是我们无法掌控的，而另外的90%却是我们能掌控的。
费斯汀格在书中举了这样一个例子。
卡斯丁早上起床后洗漱时，随手将自己高档手表放在洗漱台边，妻子怕被水淋湿了，就随手拿过去放在餐桌上。儿子起床后到餐桌上拿面包时，不小心将手表碰到地上摔坏了。卡斯丁疼爱手表，就照儿子的屁股揍了一顿。然后黑着脸骂了妻子一通。妻子不服气，说是怕水把手表打湿。卡斯丁说他的手表是防水的。于是二人猛烈地斗嘴起来。一气之下卡斯丁早餐也没有吃，直接开车去了公司，快到公司时突然记起忘了拿公文包，又立刻转回家。可是家中没人，妻子上班去了，儿子上学去了，卡斯丁钥匙留在公文包里，他进不了门，只好打电话向妻子要钥匙。妻子慌慌张张地往家赶时，撞翻了路边水果摊，摊主拉住她不让她走，要她赔偿，她不得不赔了一笔钱才摆脱。待拿到公文包后，卡斯丁已迟到了15分钟，挨了上司一顿严厉批评，卡斯丁的心情坏到了极点。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当月全勤奖，儿子这天参加棒球赛，原本夺冠有望，却因心情不好发挥不佳，第一局就被淘汰了。
在这个事例中，手表摔坏是其中的10%，后面一系列事情就是另外的90%。
都是由于当事人没有很好地掌控那90%，才导致了这一天成为“闹心的一天”。试想，卡斯丁在那10%产生后，假如换一种反应。比如，他抚慰儿子：“不要紧，儿子，手表摔坏了没事，我拿去修修就好了。”这样儿子高兴，妻子也高兴，他本身心情也好，那么随后的一切就不会发生了。
可见，你控制不了前面的10％，但完全可以通过你的心态与行为决定剩余的90％。
在现实生活中，常听人抱怨：我怎么就这么不走运呢，每天总有一些倒霉的事缠着我，怎样就不让我消停一下有个好心情呢，谁能帮帮我？
这都是一个心态问题。其实能帮助自己的不是他人，而是自己。倘若了解并能熟练运用“费斯汀格法则”处事，一切问题就迎刃而解了。
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