Don't know what we lose

我們都不知道擁有些甚麼,直到失去它,

   還有,我們也都不知道我們漸漸失去些甚麼, 一直到它完全消失殆盡!

It's true that we don't know what we've got until we lose it,
  but it's also true that we don't know we've been missing until it arrives.