Jia Jiang's 100 Days of Rejection
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[1] http://www.biblegateway.com/passage/?search=Job+1&version=NI...
Getting someone to say no to your donut requested is quite different than losing your entire fortune, business, family and kids.
Of course it's important to learn why rejection or failure was encountered; some aspects are outside of our control, but those that are, we can work to change.
Where it becomes a problem is when the rejection/failure is generalized into a systematic problem that demotivates you from continuing on.