"It is He who sends down upon His servant clear verses," meaning: the Quran, "to bring you out of darkness into the light," from misguidance to guidance, meaning: those whom He wills to guide.
﴿هُوَ الَّذِي يُنَزِّلُ عَلَى عَبْدِهِ آيَات بَيِّنَات﴾ يَعْنِي: الْقُرْآن ﴿لِيُخْرِجَكُمْ مِنَ الظُّلُمَاتِ إِلَى النُّور﴾ من الضَّلَالَة إِلَى الْهدى، يَعْنِي: من أَرَادَ أَن يهديه.