„I think I am, therefore I am. I think.“

— George Carlin

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„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!“
— Jean Paul Sartre
„I do not think therefore I am a moustache“
— Jean Paul Sartre
„I am, therefore I'll think“
— Ayn Rand
„I think. I am. I will.“
— Ayn Rand