„Sometimes I think,” he told Tex, “that Th’Wing thinks that I am an idiot studying hard to become a moron—but flunking the course.“

— Robert A. Heinlein

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„Sometime I think; and sometime I am.“
— Paul Valéry
„I think I am mad sometimes.“
— Sylvia Plath
„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 think I am, therefore I am. I think.“
— George Carlin