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  5. Cogito cogito ergo cogito sum -- I think that I think,...

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
Thinking, Philosopher, Made
Ambrose Bierce (2016). “The Devil's Dictionary: The Devil World”, p.28, 谷月社
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.