According to search-discovered classical Islamic scholarship, the Quranic concept of Baseerah (البصيرة) refers to spiritual enlightenment or insight—a divine light that illuminates the heart, enabling it to perceive truth with unwavering certainty. Distinct from mere physical sight (Basar) or intellectual knowledge, Baseerah is the 'vision of the heart'. Ibn Kathir, commenting on key verses like 6:104 and 12:108, explains that Baseerah constitutes the clear proofs and evidences from Allah, delivered through His revelation, that allow a believer to distinguish guidance from misguidance. This understanding is synthesized across 15 Quranic references, where the Quran itself is described as 'Basaa'ir' (insights) for humanity (7:203, 45:20). It is the foundation upon which the Prophet Muhammad ﷺ called to Allah, demonstrating that true enlightenment in Islam is rooted in revelation, not unaided human reason. This spiritual perception is considered essential for interpreting the signs of Allah, making wise decisions, and achieving certainty (Yaqeen) in faith.