This paper re-examines René Descartes' formulation cogito ergo sum by placing it in tension with dramatic representations of speech, subjectivity, and recognition. While Cartesian philosophy locates existence in interior thought, this study argues that early modern and modern drama reveal subjectivity to be constituted through speech acts embedded in structures of power. Through close textual analysis of Christopher Marlowe's Doctor Faustus, William Shakespeare's Hamlet, and Harold Pinter's The Birthday Party, the paper demonstrates how utterance functions not merely as expression but as performative action. Drawing on J. L. Austin's theory of speech acts, Michel Foucault's account of discourse, Judith Butler's concept of performativity, and Gayatri Chakravorty Spivak's critique of voice and recognition, the analysis shows that identity depends upon the conditions under which speech is acknowledged. Faustus's contractual language binds him within theological discourse; Hamlet's theatrical speech produces truth through performance; Stanley's fragmented speech and eventual silence reveal the collapse of subjectivity under coercive discourse. The study concludes that dramatic literature challenges Cartesian interiority by articulating a relational ontology in which being is constituted through speaking and being recognized.