Repetition may simply recur to the same wording or assertion. Tadhyīl adds a distinct predicative statement whose significance embraces the earlier meaning. Therefore, a repeated expression and a reinforcing appendix must not automatically be treated as identical techniques.
«العلم نافع، العلم نافع»
Knowledge is beneficial; knowledge is beneficial.
Here the original sentence is merely repeated. By contrast, «العلم نافع؛ ما من معرفة صحيحة إلا ولها أثر» supports a specific statement by a broader proposition. Identification depends on what the second clause conveys, not on a surface count of repeated words.