والبلاغة في الكلام مطابقته لمقتضى الحال مع فصاحته
Balagha in discourse is its conformity to what the situation calls for, together with its fasaha.
The definition combines 2 necessary conditions: fluency/correctness and contextual appropriateness. A clear, well-formed sentence is not automatically rhetorically apt; its mode of presentation must suit audience, purpose and circumstance.
If listeners already accept a report, excessive emphasis may be inappropriate. Where the information is doubted or denied, suitable confirmation can be warranted.