This one is pure stoicism. Maybe not your thing. But it has merit. Don’t get hung up on stuff.
Or:
“No good thing renders its possessor happy, unless his mind is reconciled to the possibility of loss; nothing, however, is lost with less discomfort than that which, when lost, cannot be missed. ”
http://en.m.wikisource.org/wiki/Moral_letters_to_Lucilius/Letter_4