I guess Napoleon Hill was right saying:

"All who succeed in life get off to a bad start, and pass through many heartbreaking struggles before they 'arrive'. The turning point in the lives of those who succeed usually comes at the moment of some crisis, through which they are introduced to their 'other selves'. "

A loss of someone or something dear to us is certainly heartbreaking, but I guess it's just life that has to go thru. Reality is cruel. The feelings of crisis may not last long if we come to a realization that a loss can be a release or a relief for someone, esp. those suffering in pains. It's better to let go than hold it/him/her in pain. Yet, the loss is painful, but sometimes holding it and not letting go may be even more painful in the long run. So, the duration of any crisis depends on how soon we can accept the reality and this realization. And only after we accept this reality can we move on to a new self or a higher being.

Thanks,
Amos Chan
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http://www.lifecrisisguide.com/blog