Edward C. answered 04/03/15
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I'm not an English major, but it sounds like you are describing the quote
I think, therefore I am
made by the French philosopher Rene Descartes, who by the way was also a mathematician and in fact our system of Cartesian coordinates is named after him.
I had a co-worker once who had a cartoon in his office of a scientist sitting in a chair at a desk rubbing his chin and the thought bubble above his head read "I think, therefore I am paid". I always thought that was kind of funny. But it's true too, and it's good work if you can get it.