Not every addition is eloquent. Completion supplies a meaningful missing feature or improves the audience’s understanding; padding increases the wording without a corresponding gain.
Illustration: “He is generous; his aid arrives first in times of hardship” adds an important dimension. Simply piling up “very, extremely, exceedingly generous” need not create a new idea.
The test connects with the earlier treatment of brevity and elaboration: additional words are justified by their contribution to meaning.