Comparative studies reveal the universal nature of human thought. Not only can themes appear as the common trait within two works, but also similitude may disguise itself in characters. In this article, the researcher juxtoposes two brothers form Shakespeareʼs play, King Lear, with two brothers from Sam Shepardʼs True West while drawing on the Derridean concept of "authenticity." As a matter of fact, Derridaʼs concept of "difference" is applied practically; that is, each brother and his counterpart in the other play not only share some similarities but reveal shades of difference as well. Edgar and Edmund are considered in opposition to each other, but Austin and Lee, though seemingly diametric, have streaks of common points, which are reversed at the end of the play. The findings confirm that canonical literary themes can still be considered universal, as a classic play from the seventeenth century by a British writer approximates a dramatic piece from the postmodern era by an American dramaturge. This is of paramount significance since in the Derridean philosophy of literature the universality of literature is questioned. Refuting the "grand narratives" or posing "ideology" in order to indirectly obliterate the difference between literary and literal language, the other postmodern thoughts also adopt the same position.Surveying world literature leads one to the idea that themes are stable but their representations differ; this could be generalized to characters since man innately tends to good and repels evil. This fact is even admitted by the philosophers who question the stability of existence. Although arguing against "the transcendental," hence "the unitary" and "universal," believing that the "literary text [is] radically situated-written and read and re-read at particular times and places-and as possessing a singularity (each time)," 1 Jacques Derrida says, "'ideas' … belong to everyone; *they are+ universal in their essence." 2 Further, his "trace," which is embedded in postmodern notions such as "intertextuality," in one respect flies in the face of the critical idiom, "ideology," which presumes that a system determines the authorʼs unconscious, so each work is, regionally speaking, wrought in particular. In fact, what do the ideas of "trace" or "intertextuality" indicate but the fact that words and thoughts are shared? They are, in other words, borrowed and lent