A 25-year-old losing a first job can’t know yet that all of life is a constant ebb and flow. And all the ebbs yet to come can be seen as blessings in disguise as well. Great inner growth is usually the by-product. Possessing the knowledge that vicissitudes are natural is one advantage age always has over youth.
There is no sure way to know when one is actually in a fortunate period of life. Once I was very unhappy for nine months in a job that I disliked. In retrospect I believe this was actually a period of real internal growth, having repercussions that have reverberated down all the 20 years since. I had felt almost compelled to get a job. On some level, did I choose the unhappiness of that job as a necessary byproduct to a speedier learning process?
It really is fruitless to look back unless it teaches a way to take a better route in the future.