  No less important than Heraclitus’ message is the form in which he imparts it to his audience. Aristotle noticed that even in the first sentence of B1, quoted above, the force of the word ‘forever’ was unclear: did it go with the preceding or the subsequent words, with ‘being’ or ‘prove’ (Rhetoric 1407b11–18)?  He regarded the ambiguity as a weakness in Heraclitus’ communication. But if we attend to Heraclitus’ language we see that syntactical ambiguity is more than an accident: it is a common technique he uses to enrich his words and to infuse them with a unique verbal complexity like that of poetry. Charles Kahn (1979: 89) identifies two general traits of Heraclitus’ style, linguistic density and resonance. The former is his ability to pack multiple meanings into a single word or phrase, the latter his ability to use one expression to evoke another. To take a simple example: