I. IntroductionWhen we think about the self, we are led to accept the idea of ​​a personal identity that survives over time. This tendency is reflected in substance theory, the belief that the self is not just a set of properties such as experiences and perceptions, but the vehicle for possessing these properties. Bundle theory makes the opposite argument. The theory states that inclinations for a personal identity are natural but imperfect, since the self is simply a collection of perceptions. Both theories have broad support, but the bundle theory better explains the true nature of the individual. While the substance theory lacks real evidence for its view of the self, the bundle theory provides a clear argument through the explanation of perception.II. Substance Theory and Substrate The idea of ​​substance comes from the Latin word substansia, which means "something that underlies or grounds things" (Robinson). Substance theorists believe in the need for a substance that is able to “endure” the properties attributed to it. In the Categories Aristotle supports the idea of ​​a primary substance, which cannot be predicated of anything else (Robinson). Primary substances were “objects of predication” that could take on a series of contradictions; for example, they might go from hot to cold. Without substance properties would cease to exist (Robinson). René Descartes supported this idea, saying, "In general, no act or accident can exist without a substance to which it belongs." Locke also believed in this idea that properties must be possessed by something in order to exist. He argued for the existence of a substrate that could support these properties (Bennett). The substrate, also kn...... center of the card ...... Life: Two bundled visions of personal identity. "Richmond Journal of Philosophy. 5 (2003): page no. Web. 12 December 2013. Benovsky, Jiri. "The self: a human package and/or a Cartesian substance?". European JournalOf Analytic Philosophy. 5.1 (2009) : 7-19.Bennett, "History of Philosophy Quarterly". 48. Print. Robinson, Howard. “Substance.” The Stanford Encyclopedia of Philosophy, 16 December 2009. Web. 12 December 2013. Sider, “Bare Particulars.”. 2013.