Allah's will and decree

قَالَ إِنَّمَا يَأْتِيكُم بِهِ ٱللَّهُ إِن شَآءَ وَمَآ أَنتُم بِمُعْجِزِينَ

He said, "Allāh will only bring it to you if He wills, and you will not cause [Him] failure.

وَجَعَلْنَا مِنۢ بَيْنِ أَيْدِيهِمْ سَدًّا وَمِنْ خَلْفِهِمْ سَدًّا فَأَغْشَيْنَـٰهُمْ فَهُمْ لَا يُبْصِرُونَ

And We have put before them a barrier and behind them a barrier and covered them, so they do not see.