Yet the result of the separation was not the…

Yet the result of the separation was not the liberation of reason from the thrall of the passions. It was the shocking revelation that reasoning requires the passions. Jefferson's model fits better: when one co-emperor is knocked out and the other tries to rule the empire by himself, he's not up to the task.

— from The Heart in the Cockpit (Emotion/Awe/Anxiety/Regret/Empathy) · Righteous Mind: Why Good People Are Divided by Politics and Religion by Jonathan Haidt

In the book

A person with a perfectly working logical brain but no working emotional system cannot even make ordinary choices; the reasoning just runs and runs and never lands. The old idea that reason should rule and passion should be chained turned out to be exactly backward: reasoning itself requires the passions. The intuitive mind, as the epigraph says, is the sacred gift; the rational mind is only the faithful servant. — The Heart in the Cockpit (Emotion/Awe/Anxiety/Regret/Empathy)

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