Naive irrationality is the refusal to refer actions and sentiments to abstract principle; decadent irrationality is the insistence on it.
Operations of thought are like cavalry charges in a battle — they are strictly limited in number, require fresh horses, and must only be made at decisive moments.
Our idea that beliefs, in themselves, can make one virtuous — what is it but grace by faith?
What is provably false is generally trivial.
A class of failed disciplines — psychiatry, education, macroeconomics — unable to raise the mean, lower the variance and declare victory.
What politicians say about science is as silly as what scientists say about politics.
Placebo is most of medicine, and nocebo is most of philosophy.
Everyone is conservative about what he understands, and ought to be about what he does not.
Humans have improved modestly in acquiring knowledge but vastly in transmitting it.
Reasonable, adj. Good at thinking of reasons.
If none of your other beliefs depend on evolution being true, you might as well be a creationist.