Cogito ergo sum. <i>(I think, therefore I am.)</i>

Descartes had his famous cogito ergo sum; but Thomas had added to it with his “Since I doubt, I think; since I think, I exist.” Well, I was certainly full of doubt. Doubt implied self-awareness, and a concern for one’s future. So I was a conscious entity, barring evidence to the contrary. One down.

Cogito ergo sum

I am ... cogito ergo sum ... I think, therefore I am.

Ich denke also bin ich (cogit ergo sum)

De omnibus dubitandum. (Doubt everything.)

I doubt, therefore I think, therefore I am.

Descartes, reasoning unconsciously according to the prejudices of the old metaphysics, and seeking an unshakable foundation for philosophy, an aliquid inconcussum, as it was said, imagined that he had found it in the self, and posited this principle: I think, therefore I am; Cogito, ergo sum. Descartes did not realize that his base, supposedly immobile, was mobility itself. Cogito, I think — these words express movement; and the conclusion, according to the original sense of the verb to be, sum, ειναι, ou חיח, (haïah), is still movement. He should have said: Moveor, ergo fio, I move, therefore I become!

"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."

Nebulat ergo cogito.

Je pense, donc je suis; English: I think, therefore I am)

"I love to doubt as well as know."
~ Dante's Inferno, Canto XI, 93: "non men che saver, dubbiar m'aggrata."

"Instead of René Descartes' famous "Cogito ergo sum" (I think, therefore I am), I propose "Communico ergo sum," (I communicate, therefore I exist") as the philosophical proof of man's existence.

Since I doubt, I think; since I think, I exist.