This article looks at the complexity of the thought processes that lead Seneca's Oedipus to choose the mors longa of blindness as punishment for his crime (in his blindness, he is to live in a kind of ostracism, separately from both the living and the dead). It offers an analysis of the consolation of this existence on the threshold between life and death, notably with reference to the end of the Oedipus, but also of the sorrow of this liminal existence. The latter is described in Seneca's Phoenissae, which suggests an escape, by death stricto sensu, from the threshold represented by blindness, by which Oedipus now feels trapped.
By examining these three topics, the article shows how the threshold between life and death which Oedipus chooses at the end of Seneca's Oedipus and experiences in the Phoenissae mirrors the ambivalence and the errors of his life before he blinded himself. Ultimately, it also illustrates Oedipus’ continuing failure to achieve self-knowledge.