وَرِضْوَانٌ مِنَ اللَّهِ أَكْبَرُ
And the good pleasure of Allah is greater. (al-Tawbah 9:72)
In “وَرِضْوَانٌ مِنَ اللَّهِ أَكْبَرُ”, the indefinite “رِضْوَانٌ” occurs in a comparison that foregrounds the supreme worth of divine pleasure. Indefiniteness can elsewhere help express abundance or magnitude.
وَإِنْ يُكَذِّبُوكَ فَقَدْ كُذِّبَتْ رُسُلٌ مِنْ قَبْلِكَ
If they deny you, messengers before you were also denied. (Fāṭir 35:4)
The indefinite plural “رُسُلٌ” presents multiple earlier messengers without individually naming them. Multiplicity, kind, importance and disparagement are possible contextual purposes—not meanings mechanically attached to every indefinite noun.