Abstract: By examining the use, conception and deployment of shingon or "true words" in Japanese history, this paper attempts to define the operation of a "discontinuous structure" which treats the relation between sound, speech and meaning in Japanese history. This paper begins with a presentation of the 17th century work Shikidô Okagami [The Great Mirror of the Way of Eros] and argues for a combinative theory of Eros that includes Buddhism, Shinto and popular social practices. It then expands into a broader discussion of the roles of language and meaning found in this discourse and provides an English translation, and analysis, of one example of the mature form of this discourse. In conclusion, it is argued that the precise relation between sound and meaning, between words and insight, is an often replicated but discontinuous structure found at key moments in Japanese history.