Dubito ergo cogito, cogito ergo sum'
(I doubt therefore I think, I think therefore I am)

Cogito ergo sum. (I think, therefore I am.)

Cogito, ergo sum.

Cogito, ergo sum

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.)

With Descartes the Cogito ergo sum [I think, therefore I am] turns into Cogito ergo res sunt [I think, therefore things are].

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!

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!

"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."