“Something that is yours forever is never precious”
Source: My Name Is Asher Lev
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Chaim Potok 21
American rabbi 1929–2002Related quotes
“If good things lasted forever, would we appreciate how precious they are?”
Source: It's a Magical World: A Calvin and Hobbes Collection

“My ma says a rock lasts forever, but people don’t, and that’s what makes them more precious.”
Source: Palace of Stone

Lurker's Guide to Babylon 5 : "Passing Through Gethsemane : jms speaks" (13 July (2004) http://www.midwinter.com/lurk/countries/us/guide/048.html.
Context: As an atheist, I believe that all life is unspeakably precious, because it’s only here for a brief moment, a flare against the dark, and then it’s gone forever. No afterlives, no second chances, no backsies. So there can be nothing crueler than the abuse, destruction or wanton taking of a life. It is a crime no less than burning the Mona Lisa, for there is always just one of each. So I cannot forgive.