Another monthly installment of the rationality quotes thread. The usual rules apply:
Please post all quotes separately, so that they can be upvoted or downvoted 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Do not quote yourself.
Do not quote comments or posts from Less Wrong itself or from Overcoming Bias.
No more than 5 quotes per person per monthly thread, please.
Coincidences … are the worst enemies of the truth. (Les coïncidences … sont les pires ennemies de la vérité.
—Gaston Leroux, Le mystère de la chambre jaune
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Another monthly installment of the rationality quotes thread. The usual rules apply: