“The brain may be regarded as a kind of parasite of the organism, a pensioner, as it were, who dwells with the body.”
Parerga and Paralipomena (1851), Aphorisms on the Wisdom of Life
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Arthur Schopenhauer 261
German philosopher 1788–1860Related quotes

The Tragic Sense of Life (1913), I : The Man of Flesh and Bone

Ṣaḥīḥ al-Bukhārī 5665, Ṣaḥīḥ Muslim 2586
Sunni Hadith

You'd rot away in a month if every organ of your body went out for itself.
1974 Larry King Interview https://www.youtube.com/watch?v=RVOPkGAtt48

As quoted in Karl Marx: A Life, by Francis Wheen, London: UK, Fourth Estate (1999) p. 340.
“The brain is a gland of unity: the brain is one with the body.”
The Fabric of Mind (1985)