“Philosophy, which formerly raised man to feel conscious of himself because he was a thinking being and to say, ‘I think therefore I am,” now raises him to say … “I think, therefore I am not,” (unless he takes thought into consideration only in that humble region where it is confused with action).”

“I think where I am not, therefore I am where I do not think. I am not whenever I am the plaything of my thought; I think of what I am where I do not think to think.”

“I think, therefore I am… confused.”

“The ‘I think, therefore I am’ of Descartes, the ‘I feel, therefore I am’ of late eighteenth century Romanticism, and the ‘I possess therefore I am’ of bourgeois man are dogmas, partial at that, incorporated to define a being that is incapable of defining itself.”

“I think I am, therefore I am. I think.”

“I am. I am, I exist, I think, therefore I am; I am because I think, why do I think? I don't want to think any more, I am because I think that I don't want to be, I think that I… because… ugh!”

“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!”

“I doubt, therefore I think, therefore I am.”
Cogito, ergo sum.

“I think, therefore I am.”

“I am, therefore I think.”