Two quotes, but posted together as they're so closely related.
"In the Way of Bayes, the prior probability equals the expected posterior probability: If you know your destination, you are already there."
"If you know your desired moral destination, you are already there."
I always see that the monthly Rationality Quotes thread has this line: "Do not quote comments/posts on LW/OB - if we do this, there should be a separate thread for it." This is the thread for those quotes.
This is a (possibly) monthly thread for posting any interesting rationality-related quotes you've seen on LW/OB.