Here's the new thread for posting quotes, with the usual rules:
Please post all quotes separately, so that they can be voted up/down separately. (If they are strongly related, reply to your own comments. If strongly ordered, then go ahead and post them together.)
Do not quote yourself
Do not quote comments/posts on LW/OB
No more than 5 quotes per person per monthly thread, please.
There's plenty of inherently unknowable things around. For instance, almost all real numbers are uncomputable and even undefinable in any given formal language.
Here's the new thread for posting quotes, with the usual rules: