(You are not a controller over them) meaning: (not one empowered) to compel them to believe.
﴿لست عَلَيْهِم بمصيطر﴾ أَيْ (بِمُسَلِّطٍ) تُكْرِهُهُمْ عَلَى الْإِيمَانِ
