"Things must change in order to stay the same"

I once heard someone-- I forget who-- say, "Things must change in order to stay the same."
Craziness. People change so much. One day you know a person better than anyone else knows them; the next day they do something that just makes you say, "Who is that person?!?"
How is it that I can be one person one moment and another person the next moment, yet remain "Ryan Wayne DeWalt"?
What makes me me? Am I the things I own? Am I the actions I take? Am I the thoughts I think? Am I a follower of Christ and that's all that matters? Is the only reality embedded within my name?

I can barely remain the "self" that I am, so how do I expect others to be the same person the next time I see them? Does this mean that whenever I get together with one of my friends that I am, essentially, learning who they are all over again?
I feel like this could be a killer for romance because you will never actually know the person, but, then again, I think it could enforce love (no matter what relationship) even more.
If I think about my best relationship, which is from God, then maybe that will help me more with thinking about it.
Drawing a blank...
Is the answer definition? I don't think so...
Drawing a blank...
shalom...