quiet-the-power-of-introverts-in-a-world-that-cant-stop-talking-susan-cain

experience (“thinker, dreamer”), conscientiousness
(“idealist”), and neuroticism
(“shy individual”).
A long line of poets, scientists, and
philosophers have also tended to group
these traits together. All the way back
in Genesis, the earliest book of the
Bible, we had cerebral Jacob (a “quiet
man dwelling in tents” who later becomes
“Israel,” meaning one who
wrestles inwardly with God) squaring
off in sibling rivalry with his brother,
the swashbuckling Esau (a “skillful
hunter” and “man of the field”). In classical
antiquity, the physicians Hippocrates
and Galen famously proposed
that our temperaments—and destinies—were
a function of our bodily
fluids, with extra blood and “yellow
bile” making us sanguine or choleric
(stable or neurotic extroversion), and
an excess of phlegm and “black bile”
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