...

"There are some things in this world that can be done over, and some that can't.

And time passing is one thing that can't be redone. 

Come this far, and you can't go back."

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"After a certain length

of time has passed, things harden up. Like cement hardening in a bucket. And we

can't go back anymore. What you want to say is that the cement that makes you up

has hardened, so the you you are now can't be anyone else."

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Haruki Murakami - South of the Border, West of the sun