The Role of Intellect ('Aql)

وَمَا كَانَ لِنَفْسٍ أَن تُؤْمِنَ إِلَّا بِإِذْنِ ٱللَّهِ ۚ وَيَجْعَلُ ٱلرِّجْسَ عَلَى ٱلَّذِينَ لَا يَعْقِلُونَ

And it is not for a soul [i.e., anyone] to believe except by permission of Allāh, and He will place defilement upon those who will not use reason.