Forgive me if I'm wrong, but haven't we met before.
如果我弄错的话请原谅我,我们以前见过面吧?
While (or Where) there is life there is hope.
留得青山在,不怕没柴烧。
When we use a phrase like 'it serves him right', we are, in part, admitting that a certain set of circumstances has enabled justice to act of its own accord.