Thanks for pointing this out. Even though I read Kahneman's "Thinking fast and slow", I did not truly understand that intelligence and rationality are orthogonal concepts. I've always implicitly assumed that intelligence is strongly correlated with rationality, but it seems there is a mild correlation at best: " it is a mild predictor at best, and some rational thinking skills are totally dissociated from intelligence"[0]

[0]http://www.project-syndicate.org/commentary/rationality-vers...

Hence the value of meditation.[1]

[1]. http://www.alternet.org/story/152011/how_meditation_makes_yo...