Letter 108 — On the Approaches to Philosophy (§10)

“Cleanthes used to say: “As our breath produces a louder sound when it passes through the long and narrow opening of the trumpet and escapes by a hole which widens at the end, even so the fettering rules of poetry clarify our meaning.” The very same words are more carelessly received and make less impression upon us, when they are spoken in prose; but when metre is added and when regular prosody has compressed a noble idea, then the selfsame thought comes, as it were, hurtling with a fuller fling.”