misguidance and deception

وَإِنَّهُمْ لَيَصُدُّونَهُمْ عَنِ ٱلسَّبِيلِ وَيَحْسَبُونَ أَنَّهُم مُّهْتَدُونَ

And indeed, they [i.e., the devils] avert them from the way [of guidance] while they think that they are [rightly] guided