“Cogito cogito ergo cogito sum -- "I think that I think, therefore I think that I am;" as close an approach to certainty as any philosopher has yet made.”

— Ambrose Bierce

The Devil's Dictionary (1911)
Source: The Unabridged Devil's Dictionary
Context: Cartesian, adj. Relating to Descartes, a famous philosopher, author of the celebrated dictum, Cogito ergo sum -- whereby he was pleased to suppose he demonstrated the reality of human existence. The dictum might be improved, however, thus: Cogito cogito ergo cogito sum -- "I think that I think, therefore I think that I am;" as close an approach to certainty as any philosopher has yet made.

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Ambrose Bierce204

American editorialist, journalist, short story writer, fabu… 1842–1914

Étienne Gilson (1884–1978) French historian and philosopher

I think, therefore things are
Methodical Realism

“The truth is sum, ergo cogito — I am, therefore I think, although not everything that is thinks. Is not consciousness of thinking above all consciousness of being?”

Miguel de Unamuno (1864–1936) 19th-20th century Spanish writer and philosopher

The Tragic Sense of Life (1913), II : The Starting-Point
Context: The truth is sum, ergo cogito — I am, therefore I think, although not everything that is thinks. Is not consciousness of thinking above all consciousness of being? Is pure thought possible, without consciousness of self, without personality? Can there exist pure knowledge without feeling, without that species of materiality which feelings lends to it? Do we not perhaps feel thought, and do we not feel ourselves in the act of knowing and willing? Could not the man in the stove [Descartes] have said: "I feel, therefore I am"? or "I will, therefore I am"? And to feel oneself, is it not perhaps to feel oneself imperishable?

“And he arrives at the cogito ergo sum, which St. Augustine had already anticipated… "I think therefore I am," can only mean "I think, therefore I am a thinker"; this being of "I am," which is deduced from "I think," is merely a knowing; this being is a knowledge, but not life. And the primary reality is not that I think, but that I live, for those also live who do not think. Although this living may not be a real living. God! what contradictions when we seek to join in wedlock life and reason!”

Miguel de Unamuno (1864–1936) 19th-20th century Spanish writer and philosopher

The Tragic Sense of Life (1913), II : The Starting-Point

“Not only the artist but everyone "becomes someone else" in becoming someone. One is thought about, thus invented. Or as Steinberg put it with memorable succinctness in his Cogito drawings, "I think, therefore Descartes is." One creates not oneself but another. Being is in the act.”

Harold Rosenberg (1906–1978) American writer and art critic

Source: Art & Other Serious Matters, (1985), p. 196, "Saul Steinberg"

“It took me years to realize that a computer would never truly be able to say cogito ego sum although dozens of lurid Hollywood movies about robots want to leave that impression. A computer thinks…. that is, it realizes it has been switched on…but it doesn't know it exists.”

John Twelve Hawks book Spark

Spark (2014)

“One kind of person is engaged in society without realizing it; another kind engages in society by controlling it. The one is a gear, a cog, and the other an engineer, a driver. But a person who has opted out has only his ability to express his disengagement between his existence and nothingness. Not cogito, but scribo, ergo sum.”

John Fowles book Daniel Martin

Daniel Martin (1977)