We look at two famous examples of foundational principles: on one hand we have Descartes (Cogito Ergo Sum), and we have Locke (Tabula Rasa). Between these two thinkers, who do you believe is right? Do you believe that Decartes is correct and that, the first thing that I know is that I am. Or do you find yourself believing Locke, and the idea that everything is known through experiences.