It may seem paradoxical to consider a personal crisis as having any benefit since it's painful. But it can help, and in more ways than one. What is believed a personal crisis differs and can seem different to others. After receiving notice of being laid off at a job, I received frequent condolences to which I gave the expected downcast response. Yet I really felt overjoyed at leaving the job where I likely would have lingered had this not happened, my life thereafter changing for the better.
Medical crises are different since they cause one to question their mortality. But even this can benefit for, as some have said, they were better people after their illness.
A crisis forces one from their usual way of relating into a different sphere of experience. Providing the potential to better understand themselves by recognizing their strengths and limitations, viewing themselves differently and realizing what is important in their life. Some people can only change when pressured by a crisis which, sensing this, their unconscious creates. Insight can arrive in odd ways.