Need help with my comprehension and translation

Translation: You won't lose what you haven't had! Don't keep what is not yours and you can't hold onto something that "is not possible to keep."????? What does the last line mean.
I make no apologies for my futile attempt to translate this well. I am still learning what I consider to be a very complex language. I would appreciate some help here. Thanks for your generosity.
1 Answer
You can't hang on to something that doesn't want to stay put, (Somewhat colloquial English here.)