which of these rhetorical devices does emerson use here

trust thyself every heart vibrates to that iron string

rhyme
metaphor
meter
parallelism

The rhetorical device used in the given statement by Emerson is parallelism. This is because the structure of the sentence depicts parallelism with the repetition of the word "thyself" in the clause "trust thyself" and the repetition of the word "that" in the clause "every heart vibrates to that iron string."

In the phrase "Trust thyself, every heart vibrates to that iron string," Ralph Waldo Emerson uses parallelism as a rhetorical device. Parallelism refers to the repetition of grammatical structures, patterns, or ideas in a sentence or passage. In this case, the parallel structure is evident in the repetition of the verb and pronoun "trust thyself" and the phrase "every heart."

To determine which rhetorical devices Emerson uses in the given quote, we can analyze the different options:

1. Rhyme: Rhyme refers to the repetition of similar sounds at the end of words. In the quote, "trust thyself" and "heart vibrates" do not exhibit rhyme.

2. Metaphor: Metaphor is a figure of speech that compares two different things by stating one thing is another. In the quote, there is no direct metaphor present.

3. Meter: Meter is the pattern of stressed and unstressed syllables in poetry. The quote does not conform to a specific meter pattern, so meter is not present.

4. Parallelism: Parallelism is the repetition of grammatical structures in successive sentences or clauses. In this case, the quote does exhibit parallelism with the repetition of the pronoun "thyself" and the similar structure of "trust thyself" and "every heart vibrates."

Based on this analysis, the rhetorical device used by Emerson in the given quote is parallelism.