يَا أَيُّهَا الْإِنْسَانُ مَا غَرَّكَ ... ۞ يَا أَيُّهَا الْإِنْسَانُ إِنَّكَ كَادِحٌ ...
O human being, what has deceived you? ... O human being, you are surely striving toward your Lord. (82:6; 84:6)
The same vocative construction is followed by two different speech acts. In the first, interrogation shakes the audience out of heedlessness; in the second, an emphatic report establishes the certainty of an unavoidable encounter. Thus a rhetorical result cannot be derived from the vocative in isolation.
VerseAfter the vocativePrimary purpose
82:6Mā gharrakaRebuke and warning
84:6Innaka kādiḥEmphasis and accountability
A single syntactic form may produce distinct effects depending on the communicative situation. This is a core application of ʿilm al-maʿānī.