Yiddish: You'll see it when you see your own ears.

You'll never see it again.  It's gone forever.  Literal translation: You'll see it like (you see) your ears. SOURCE: Bernstein, Jüdische Sprichwörter und Redensarten.

‎דו וועסט עס שוין זען ווי דײַנע אויערן.

Du vest es shoyn zen vi dayne oyern.

You'll see it when you see your own ears.