Rationality quotes: April 2010

wnoise

This is our monthly thread for collecting these little gems and pearls of wisdom, rationality-related quotes you've seen recently, or had stored in your quotesfile for ages, and which might be handy to link to in one of our discussions.

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Do not quote yourself.
Do not quote comments/posts on LW/OB.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.

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Do not quote yourself.
Do not quote comments/posts on LW/OB.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.

If you can be sure of being right only 55 percent of the time, you can go down to Wall Street and make a million dollars a day. If you can't be sure of being right even 55 percent of the time, why should you tell other people they are wrong?

Dale Carnegie, How to Win Friends and Influence People

Death by Lob's Theorem to this quote.

11sketerpot16y

Rephrase that and it sounds nonsensical: "If you can't outperform the stock market, then how can you be sure of anything?" I think Carnegie was just looking for a glib rationalization for his advice to avoid contradicting people whom you want to like you.

8JGWeissman16y

What if I am right 9 times out of 10 when I say I am 90% sure of something, but I am never or very rarely more than 50% sure of propositions of the form "This stock's price will go up/down, over a relevant time frame"?