The limits of my language mean the limits of my world.
The original German version is 
Die Grenzen meiner Sprache bedeuten die Grenzen meiner Welt.
Quite remarkably, while searching for this quote online, I noticed that two of the most highly ranked websites for quotes, brainyquotes.com and quotes.thefameouspeople.com, quote Wittgenstein incorrectly as
The limits of my language means the limits of my world.
 L. Wittgenstein, Tractatus Logico-Philosophicus, see Google Books.