Balance. Karma. Strength.
You've heard the adages:
You can't experience the sweet without first tasting the sour.
When one door slams in your face, another is wide open.
What goes around comes around.
Every cloud has a silver lining
The ying and the yang.
Life is cyclical. You experience pain but later discover that pain was designed as a life lesson to better prepare you to handle a similar situation in the future. Or, sometimes you wonder if the world purposely shits on you so that the problems you once thought problematic, aren't actually such a big deal. I once had a friend tell me that she thanks the people in her life that hate her because it propels her forward to success, despite the negative forces of energy that want her to fail.
In any circumstance, the good will always outweigh the bad and everything is a life lesson. One thing I'm certain of in my own life is that I will never go backwards. You live and learn and grow and love and one day, you look in the mirror and realize that a weak and scared child has grown into a woman with backbone who will do anything to protect the ones who are worth it.