He, may Allah be pleased with him, conveyed the meaning of the Saying of Allāh Most High

اللَّهُ وَلِيُّ الَّذِينَ آمَنُوا يُخْرِجُهُم مِّنَ الظُّلُمَاتِ إِلَى النُّورِ ۖ وَالَّذِينَ كَفَرُوا أَوْلِيَاؤُهُمُ الطَّاغُوتُ يُخْرِجُونَهُم مِّنَ النُّورِ إِلَى الظُّلُمَاتِ ۗ
Allāh is the walī of those who have imān, he brought them out from the darknesses to the light, while those who have kufr, their walīs are Taghūt. They take them out from the light to the darknesses.

Indeed, nūr (light) is made singular as Imān is a single dīn. Therefore nur is attributed with one-ness. Kufr is of many types and therefore zhulumāt is attributed with plurality.

He derived benefit as well from the signification of the exitting of the kāfir from nūr – how is he ever attributed with nūr? For the kāfir, considering the fact that he is initially attributed with Imān by fitrah (natural constitution), and then truth is brought to him through tongues of Prophets, but he turns away from the true Dīn and rejects after it becomes evident to him, it is thus true for him, that he has exited from the nūr to the zhulumāt.