FTP what thinker in his Meditations on First Philosophy decided the only thing he could truly know is his own existence, which he phrased Cogito ergo sum?
Voltaire, in his work Philosophical Letters, contrasted English and French philosophical views by contrasting Newton and this thinker. This man argued that 2+3=5 is a true proposition whether one is dreaming or awake, and thus has a different value from sense information. To consider the latter, he proposed a hard piece of wax which has different sense properties after being placed near a flame. In the same work he discussed the possibility that he was being deceived by a demon in order to place himself in hyperbolic doubt. FTP what thinker in his Meditations on First Philosophy decided the only thing he could truly know is his own existence, which he phrased Cogito ergo sum?
Voltaire, in his work Philosophical Letters, contrasted English and French philosophical views by contrasting Newton and this thinker.
Rene Descartes