“What is my ruling faculty now to me?”
X, 24
Meditations (c. 121–180 AD), Book X
Context: What is my ruling faculty now to me? and of what nature am I now making it? and for what purpose am I now using it? is it void of understanding? is it loosed and rent asunder from social life? is it melted and mixed with the poor flesh so as to move together with it?
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Marcus Aurelius 400
Emperor of Ancient Rome 121–180Related quotes

“Try now to answer my third riddle. By what rule to you tell a copy from an original?”
Pilgrim’s Regress 52
The Pilgrim's Regress (1933)

History of My Life (trans. Trask 1967), 1997 reprint, v. 8, chapter 4, p. 94
Referenced

“I, who rule by means of contracts, am now slave to my contracts.”
Original: (de) Der durch Verträge ich Herr, den Verträgen bin ich nun Knecht.
Source: Quotes from his operas, Die Walküre, Wotan (ruler of the gods), Act 2, Scene 2

“We have now but to prove a third attribute: I mean the faculty of feeling”
Source: The Natural History of the Soul (1745), Ch. VI Concerning the Sensitive Faculty of Matter
Context: We have now but to prove a third attribute: I mean the faculty of feeling which the philosophers of all centuries have found in this same substance.... [T]he Cartesians have made, in vain, to rob matter of this faculty. But in order to avoid insurmountable difficulties, they have flung themselves into a labyrinth from which they have thought to escape by this absurd system "that animals are pure machines."
An opinion so absurd has never gained admittance among philosophers... Experience gives us no less proof of the faculty of feeling in animals than of feeling in men.

" How I Work http://web.mit.edu/krugman/www/howiwork.html", American Economist (1993)
How I Work (1993)