Sura al-ʿAbasa 80:3

وَمَا يُدْرِيكَ لَعَلَّهُۥ يَزَّكَّىٰٓ

wa-mā yudrīka laʿallahu yazzakkā

But what could tell thee but that perchance he might grow (in spiritual understanding)?-

Sura al-ʿAbasa 80:7

وَمَا عَلَيْكَ أَلَّا يَزَّكَّىٰ

wa-mā ʿalayka allā yazzakkā

Though it is no blame to thee if he grow not (in spiritual understanding).