The Heart in the Quran
The heart as organ of understanding: The Quran repeatedly uses the heart (qalb, fu’ad, lubb) as the organ of understanding, not the brain: “It is not the eyes that are blind, but the hearts within the chests.” (22:46) The heart’s blindness is not physical but spiritual — the inability to perceive the signs that the Quran presents. This spiritual blindness (rana, the veil that covers the heart) is the human default that iman overcomes.
The turning heart: “Our Lord, do not let our hearts deviate after You have guided us.” (3:8) — The du’a itself reflects the Quranic understanding of the heart’s instability. The Prophet prayed: “O Turner of Hearts, keep my heart firm upon Your religion.” The heart’s name (q-l-b — to turn) signals its inherent motion; the spiritual life is about directing that turning toward Allah.
Diseases of the heart: The Quran identifies several diseases of the heart: nifaq (hypocrisy — the heart that differs from the tongue), kibr (arrogance — the heart that refuses guidance), and ghafla (heedlessness — the heart that sleeps through the signs). These are spiritual-psychological conditions that Islamic ethics diagnoses and treats.
See also: Nafs The Soul, Iman And Islam, Muhasaba
Al-Ghazali’s Typology of the Heart
The heart as mirror and vessel: Al-Ghazali’s analysis in the Ihya’ ‘Ulum al-Din presents the heart as simultaneously a mirror (capable of reflecting divine light when polished) and a vessel (containing or failing to contain divine guidance). The key image: sins are rust (ran) on the mirror; dhikr and repentance polish the rust away.
The seven degrees: Al-Ghazali (drawing on earlier Sufi literature) distinguishes degrees of heart-condition — from the heart of stone (entirely sealed to divine light), through the sick heart (iman present but weakened by nafs), to the living, illuminated heart (qalb hayy munawwar) that perceives reality as it is. The spiritual path is the gradual transformation from one to another.
Qalb vs. nafs: Al-Ghazali’s distinction: the nafs (self/ego) is the heart’s lower faculty — concerned with the world’s pleasures and pains; the qalb’s higher faculty is ‘aql and the capacity for divine knowledge. The spiritual struggle is the heart’s higher faculty (reason and divine light) asserting itself over the heart’s lower faculty (nafs).
See also: Al Ghazali, Tasawwuf, Nafs The Soul, Dhikr, Al Muhasib
Ismaili Ta’wil — The Heart as Batin
The heart as the seat of ta’wil: In Ismaili understanding, the heart (qalb) is the site where the batin is received — the inner meanings of the zahir reach the soul through the heart’s capacity for ma’rifa (gnosis). The Imam’s ta’wil is not merely intellectual information but illumination — a light that enters the polished heart and transforms its perception.
The heart and misaq: At the primordial covenant (misaq), the souls acknowledged the Imam — and this acknowledgment was a recognition of the heart, not merely the intellect. The mumin’s heart already knows the Imam; walayah is the heart’s recognition and affirming of what it already knows at the level of fitrah.
The qalb-i-salim: The qalb salim (sound heart) of Ibrahim — “The day when wealth and children will not avail, except one who comes to Allah with a sound heart.” (26:88-89) — is, in Ismaili ta’wil, the heart that has received and affirmed walayah: the heart aligned with the Imam’s guidance, the heart whose zahir and batin are integrated.
See also: Tawil Esoteric Interpretation, Ismaili Philosophy, Imamah, Wali Al Asr, Understanding Walayah, Misaq The Covenant, Ilm Al Batin
See also: Nafs The Soul, Iman And Islam, Muhasaba, Al Ghazali, Tasawwuf, Dhikr, Al Muhasib, Tawil Esoteric Interpretation, Ismaili Philosophy, Imamah, Wali Al Asr, Understanding Walayah, Misaq The Covenant, Ilm Al Batin