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Quotation from Essays and Aphorisms by Arthur Schopenhauer
“The chief cause of intellectual diversity is to be found in the brain and nervous system”
Essays and Aphorisms, On Human Nature, 'Character', trans. T. Bailey Saunders (1897)

Intellect has a physiological basis, while ethical character comes directly from the will.
Citation: "The chief cause of intellectual diversity is to be found in the brain and nervous system" — Arthur Schopenhauer, Essays and Aphorisms, On Human Nature, 'Character', trans. T. Bailey Saunders (1897). (id essays-and-aphorisms-q10)
Portrait: Arthur Schopenhauer by J Schäfer, 1859b, Johann Schäfer, Public domain.
