Are we to assume that professional mathematicians are always to be regarded as the ultimate practitioners of rationality?
You're misreading the analogy. The quote means that rationalists aren't aspiring to be as good at rationality as mathematicians already are at mathematics (not rationality).
Today's post, A Sense That More Is Possible was originally published on 13 March 2009. A summary (taken from the LW wiki):
Discuss the post here (rather than in the comments to the original post).
This post is part of the Rerunning the Sequences series, where we'll be going through Eliezer Yudkowsky's old posts in order so that people who are interested can (re-)read and discuss them. The previous post was Raising the Sanity Waterline, and you can use the sequence_reruns tag or rss feed to follow the rest of the series.
Sequence reruns are a community-driven effort. You can participate by re-reading the sequence post, discussing it here, posting the next day's sequence reruns post, or summarizing forthcoming articles on the wiki. Go here for more details, or to have meta discussions about the Rerunning the Sequences series.