" Worry is a protection against future disappointment. After taking an important test, for example, a student might worry about whether he failed. If he can feel the experience of failure now, rehearse it, so to speak, by worrying about it, then failing won’t feel as bad when it happens. But there’s an interesting trade-off: Since he can’t do anything about it at this point anyway, would he rather spend two days worrying and then learn he failed, or spend those same two days not worrying, and then learn he failed? Perhaps most importantly, would he want to learn he had passed the test and spent two days of anxiety for nothing? "

― Gavin de Becker , The Gift of Fear: Survival Signals That Protect Us from Violence