Life is never a constant, static thing. It changes, every second, each minute, from the first moment when you were born, to the final breath that you take. Things come and go, events occur and end, people, they reach your life, and they can choose to stay or they can decide to leave.
Our lives change for better or worse. Some are small, some rather big. Some are benign, others lethal. In whatever magnitude they are, in whatever form they take, they add to the experiences that we have gotten from our years of living. Good changes, undeniably, make us feel better about going through the days. Getting a degree, going to an amazing trip that alter your perspective on this world, reading a good book, getting things that we have always wanted, having new friends, marriage, giving birth, getting that PhD, they are the moments that we treasure in our lives.
Bad changes, in their own twist, are the ones that probably make us appreciate how good our lives actually are. Here's the thing though, not everyone can cope with bad things. Not everyone can see that there probably is a silver lining to our lives' misfortunes. We can choose on whether to wallow in a torrent of sadness, or to use our calamities as the building bricks that help us to understand more about the nature of the thing that is life.
No matter how the changes manifest to us, they are now etched in the banks of memories we have. There are no memories too big or too small. What we select to keep or not remember all belong to our own faculties. It is of my humble opinion that we can never throw away strong memories that we have — we can put them at the back of our minds, but during a few throwaway moments, our minds think of them. What we experienced back then have made us who we are now. Bitter changes, bitter experiences, did they manage to make us bitter too? Or did we choose to craft a greater living in spite of those things?
All those changes in our lives and the memories that we make are a part of us. Even for me, I wish to not have certain things changed, but honestly, who we are today if not of those changes?