Zuhruf 40-42:

•  Öyleyse, sen (Ey Nebi, veya ey muhatap) sağıra işittirebilir, körü gördürebilir ve apaçık bir sapıklık içinde boğulup gitmişe doğru yolu gösterebilir misin?
  Biz seni vefat ettirip yanımıza alsak bile, hiç kuşkusuz onlara hak ettikleri cezayı veririz, veya onlara vaadettiğimiz cezayı sana da gösteririz, hiç şüphesiz, Biz onlara dilediğimizi yapabilecek güçteyiz.
  (
  It means to say: "Pay attention to those who are inclined to listen and have not closed their eyes to the realities, and do not consume yourself in showing the way to the blind and making the deaf to hear, nor consume yourself with the grief as to why your near and dear ones are not coming to the right path, and why they are making themselves worthy of Allah's torment."  ET
  
  This thing can be understood fully only by keeping in view the background in which it was said. The disbelievers of Makkah thought that the person of the Prophet Muhammad (upon whom be Allah's Peace) had become a source of trouble for them. If they could somehow get rid of him, matters would become normal. On the basis of this evil thought they were holding consultations day and night and planning to kill him. At this, Allah addresses His Prophet so as to tell them indirectly: "It doesn't make any difference whether you remain among them or not: if you live, you will see them meet their doom with your own eyes; if you are recalled from the world, they will be sent to their doom in your absence, because they cannot in any case escape the consequences of their misdeeds. "  ET
  
  That is, "You should not worry as to what punishment do those who are resisting and opposing the truth with injustice and dishonesty receive and when, nor should you worry whether Islam flourishes during your lifetime or not. For you this satisfaction is quite enough that you are on the Right Path. Therefore, you should go on fulfilling your mission unconcerned about the results, and leave it to Allah whether He defeats falsehood in front of you or after you. " ET
  
  )