The universe is change. Life is opinion.Marcus Aurelius, Meditations, 4.3.4b
When our hair grows long we cut it. If our nails grow long we cut them. When our cells die they are replaced by new ones. The skin on your body is entirely different than the skin you had 27 days ago.
Are you still the same person? Or are you a new one? Strictly speaking the matter that makes up who you are is entirely new. And yet I think most would all agree we are still the same person; these molecular changes do not change who we are.
But what about your thoughts and memories? Those are constantly changing. What about your job? That is likely to change several times throughout your life. Where you live? Where you live now is probably different than where you grew up or went to college. How much do these things define who you, your family, and your friends are? How much do these things inform how you think and act?
The book notes that, “Our understanding of what something is is just a snapshot — an ephemeral opinion.” This is exactly right. How you view something today is based on so many different variables it is impossible to list them all. How you think about something tomorrow could be drastically different than how you thought about it today if something changes.
And it will. It always will. Change is the only constant.
It follows then that the more fluid and malleable you are in your thoughts, actions, and opinions, the smoother your journey through life will be. Being rigid should never be a point of pride as it shows a refusal to acknowledge the weight of the universe, and that is a losing battle.