A clause states “Falsehood vanished” and is followed by “Falsehood does not endure by nature.” What is the relation?

Iṭnāb: Tadhyīl, Takmīl (Iḥtirās), and Tatmīm

• An adverbial removing ambiguity
• An essential subject for the first clause
• An unrelated separate report
• A tadhyīl confirming the overt assertion