Another month has passed and here is a new rationality quotes thread. The usual rules are:
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Do not quote yourself.
Do not quote from Less Wrong itself, HPMoR, Eliezer Yudkowsky, or Robin Hanson. If you'd like to revive an old quote from one of those sources, please do so here.
No more than 5 quotes per person per monthly thread, please.
Karl Popper used to begin his lecture course on the philosophy of science by asking the students simply to 'observe'. Then he would wait in silence for one of them to ask what they were supposed to observe. [...] So he would explain to them that scientific observation is impossible without pre-existing knowledge about what to look at, what to look for, how to look, and how to interpret what one sees. And he would explain that, therefore, theory has to come first. It has to be conjectured, not derived.
Did Karl Popper populate his class with particularly unimaginative students ? If someone asked me to "observe", I'd fill an entire notebook with observations in less than an hour -- and that's even without getting up from my chair.
Another month has passed and here is a new rationality quotes thread. The usual rules are: