The sixth of these distinguishes res extensis and res cogitans, The third part of this work proves that the external world exists because God is not a deceiver.
In one section, this works' author describes his inability to imagine the differences between a chiliagon and a myriagon to illustrate the difference between imagination and understanding. In its second section, the author notes that the properties of a piece of wax can change, suggesting that wax is known not by the senses but by the mind alone. The sixth of these distinguishes res extensis and res cogitans, The third part of this work proves that the external world exists because God is not a deceiver. For 10 points, name this work, whose author attempts to discard everything of which he is not certain and build a foundation for knowledge, the magnum opus of René Descartes.
In one section, this works' author describes his inability to imagine the differences between a chiliagon and a myriagon to illustrate the difference between imagination and understanding.
Meditations on First Philosophy