Every month on the month, Less Wrong has a thread where we post Deep Wisdom from the Masters. I saw that nobody did this yet for December for some reason, so I figured I could do it myself.

* 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* "Do not quote yourself." --Tiiba

* Do not quote comments/posts on LW/OB. That's like shooting fish in a barrel. :)

* No more than 5 quotes per person per monthly thread, please.