思想環繞著眼睛而建構，敘事則始於聽覺，思想與敘事的不同源使言說的忠實性潛藏著風險。本文以布朗肖的〈說，不是看〉為起點，反省言說傳達視覺或聽覺而展開兩種認識真理的方法。視覺以區辨揭露真理，聽覺則因欠缺明確的判準而展開對真理的永恆追尋。何者更有助於人對世界的認識？本文以塞壬之歌為例，闡釋荷馬、卡夫卡與布朗肖形構言說的三種特性。對布朗肖來說，當觀看透過言說表達時，便是將言說當做揭露真理的（視覺）工具冒著遺忘言說之所是的危險，亦使其展開的真理不乏可議之處。言說的目的不在於說中而是移動。一旦說中，便無需再說。言說停止便會消失，它只存於持續說且由聽覺認證。本文將探究言說中的運動性是否有助於追求真理。

Thought is constructed around eyes, while narrative begins with hearing. The diverse origins of thought and narrative put the fidelity of speech at risk. Starting from Maurice Blanchot’s “Speaking Is Not Seeing”, this article offers a reflection on the two ways of knowing the truth unfolded by both visual and auditory communications. Vision reveals truth by distinction, while hearing begins a permanent pursuit of truth for its lack of clear criteria. Which manner, vision or hearing, is more conducive for humans to understand the world? This article takes the Siren’s song as an example to articulate the three characteristics of speech demonstrated by Homer, Kafka and Blanchot. For Blanchot, when seeing is expressed through speech, we regard speech as the (visual) tool of revealing the truth. This manner, however, risks the danger of forgetting what the speech is and makes the truth developed by speech become debatable. The purpose of speech is not to fix, but to move. If what is said is said, one no longer speaks. Speech disappears when it stops; it only exists in its continuity recognized by hearing. Thus, this article will explore whether the movement in speech contributes to the search for truth.