وَلَلْآخِرَةُ خَيْرٌ لَكَ مِنَ الْأُولَىٰ
And the Hereafter is better for you than the first life. (الضحى: 4)
أَلَمْ نَشْرَحْ لَكَ صَدْرَكَ
Have We not expanded your breast for you? (الشرح: 1)
وَرَفَعْنَا لَكَ ذِكْرَكَ
And We elevated your remembrance for you. (الشرح: 4)
In all three expressions, laka keeps the addressee’s benefit prominent. Yet its syntactic attachment differs: khayrun laka expresses comparative benefit, nashraḥ laka relates the opening of the breast to the addressee, and rafaʿnā laka connects the raising of mention to that same person. The repeated pronoun unifies diverse claims around one recipient.
This does not turn every occurrence of laka into an automatic assertion of formal absolute exclusivity. Context may support focus or special benefit, but the directly observable effect is the sustained direction of the discourse toward the addressee. Word recurrence, syntactic relation and rhetorical intent should be identified separately.