What is Qalb in Islam? Thinking Heart and Brain Connection
On this page
- 1. Why heart keeps coming up as thinking
- 2. What Qalb actually means in Quran
- 3. Qalb vs Fuad — not same word
- 4. How Quran says hearts reason
- 5. What science found — heart has its own brain
- 6. How heart talks to brain — 4 ways
- 7. Why calm heart = clear mind
- 8. Both views together — heart guides, brain executes
1. Why heart keeps coming up as thinking
Across cultures, people say heart feels, heart knows, heart breaks. Not brain breaks. Modern science says brain does thinking. So why does every tradition, including Islam, point to heart?
That clash is interesting. Maybe both are partly right — brain thinks in one way, heart in another. Quran talks about Qalb doing jobs we'd normally give to brain — understanding, reasoning, seeing truth, being blind. Is that metaphor, or something more?
I wanted to read what Quran and Sunnah actually say about Qalb, and what new field of neurocardiology says about heart-brain talk. Both are surprisingly aligned.
2. What Qalb actually means in Quran
Word Qalb (قلب) appears 132 times in Quran. Root meaning is to turn, change, flip over. So heart is something constantly turning, changing, not static. That already tells you — it's not a fixed pump, it's dynamic, easily influenced.
Because it turns, it needs constant purification — tazkiyat al-nafs. That's why Prophet ﷺ made dua for firm hearts. Same root explains why heart is where both good and bad start — it can turn either way.
In Islamic thought, Qalb is centre of human personality — not just emotion, but intellect, morals, spirituality. It's called supreme centre, core of human, nucleus of soul. The real you inside.
3. Qalb vs Fuad — not same word
Quran uses two words often translated as heart — Qalb (132 times) and Fuad (16 times). Slight difference helps.
Qalb — قلب
From turning/changing. Deeper, spiritual and intellectual centre. Seat of faith, understanding, moral judgment, decision, wisdom. Can be pure, hard, sealed, diseased. Needs strengthening.
Fuad — فؤاد
From heat/benefit. More immediate, sensory, emotional. Place of seeing, direct knowledge from senses, feelings from input. Linked with hearing and sight in Quran 67:23.
Nice example in Quran 28:10 — mother of Musa: "Heart (fuad) of mother of Musa became empty. She was about to disclose him, had We not strengthened her heart (qalb)..." Fuad emptying = extreme shock, sensory input wiped, she can't process. Qalb strengthened = deeper faith, patience, staying firm. So fuad = immediate feelings from outside, qalb = deeper core that holds you together.
So fuad collects sensory data and feelings, qalb gives it meaning and moral direction. Fuad without sound qalb is little value.
4. How Quran says hearts reason
Quran directly links hearts with reasoning:
"Have they not travelled land and have hearts by which to reason and ears to hear? Indeed it's not eyes that go blind, but hearts in chests that go blind." — 22:46
"In this is reminder for him who has a heart or gives ear while attentive." — 50:37
Revelation came to Prophet's heart: "upon your heart that you may be of warners" (26:194). So heart receives divine knowledge, beyond logical deduction.
Hadith: Prophet ﷺ pointed to chest three times — "Taqwa is here." And famous hadith: "There is a piece of flesh in body, if it's sound whole body sound, if corrupt whole body corrupt — and that is the heart." — Bukhari, Muslim.
Imam Ghazali called qalb spiritual centre with power to know, understand, grasp, and to know Allah and draw near. He mapped qalb, ruh (soul), nafs (ego), aql (intellect). Purifying qalb is key for remembrance.
Ibn Taymiyyah said intellect is connected to both heart and brain. Brain is start of thought, imagination, processing senses. Heart is foundation of desire and choice — it decides. So imagination starts in brain, goes to heart to form desire and intention, then back to brain to act. Heart is driver, brain is implementer. That's sophisticated systems thinking from 1300s.
5. What science found — heart has its own brain
New field called neurocardiology studies heart-brain talk. Huge shift. Old view: brain tells heart what to do. New view: two-way chat, and heart sends more signals to brain than brain sends to heart, especially via vagus nerve afferents (signals from heart to brain).
Heart has intrinsic cardiac nervous system — complex network of ganglia, neurotransmitters, proteins, like small brain on heart. It can act independently — learn, remember, make decisions, feel, sense. Not just pump. It can integrate signals from sympathetic and parasympathetic and its own senses.
6. How heart talks to brain — 4 ways
1. Nerves
Vagus nerve mostly sends from heart to brain (afferent). Those signals can block or boost brain activity — front cortex, motor cortex — affecting attention and motivation.
2. Hormones
Heart makes hormones — ANF for fluid balance, stress hormone control, and even oxytocin — love/bonding hormone, similar amounts as brain. So heart chemistry helps empathy and trust.
3. Pressure waves
Heart beat creates pressure waves — heart rate variability (HRV) shows resilience to stress. Your thinking performance fluctuates with heartbeat.
4. Electromagnetic field
Heart creates strongest rhythmic EM field in body, detectable few feet away. Changes with emotion. Coherent field can sync other body systems, even be felt by others.
7. Why calm heart = clear mind
HeartMath Institute research shows different emotional states make different heart rhythms, and those rhythms affect brain:
Stress, anger, anxiety: Heart rhythm becomes erratic, disordered. That incoherent signal inhibits higher brain — clear thinking, memory, learning, reasoning, decision-making get worse. Also makes negative emotion stronger — loop.
Appreciation, joy, care, love: Heart rhythm becomes ordered, smooth, harmonious — coherent. That facilitates brain function, positive feelings, emotional stability. Autonomic nervous system branches sync, body works efficiently.
Science proves what Islam taught
This coherent state is called psychophysiological coherence — order in mental and bodily processes together. It gives optimal function, emotional stability, mental clarity, better attention, memory, problem-solving. So emotional regulation — often seen as soft skill — directly improves hard cognitive performance. Nurturing positive states, which start in heart, is direct path to clearer thinking.
8. Both views together — heart guides, brain executes
Islamic Qalb and brain-science heart-brain are not contradictory — they are complementary lenses.
Islamic Qalb
Metaphysical core, seat of faith, moral perception, divine connection, intention. Thinking here is discerning truth, recognising God, choosing good — wisdom, not just logic.
Scientific Brain
Cerebral cortex as seat of conscious thought, memory (hippocampus), reasoning, perception, problem-solving, via neural networks and plasticity.
Scientific Heart-Brain
Intrinsic cardiac system that learns, senses, modulates brain, influences emotional states via nerves, hormones, pressure waves, EM field — physiological how.
Integrated View
Spiritual heart gives direction and purpose — what to want, what is good. Brain gives means and execution — how to achieve, logical steps. Pure/coherent heart enables optimal brain function. Purity of qalb = clearer thinking + ethical action.
Ibn Taymiyyah's model — intellect connected to both heart and brain, heart as seat of desire and choice, brain for imagination — fits beautifully with neurocardiology's two-way system. Heart as moral compass, brain as processor.
So "thinking heart" in Islam is not heart doing maths. It's heart discerning truth, moral insight, intention. Science shows how heart's state creates conditions for brain to think best. One gives direction, one gives execution.
Final thought — holistic human
Quran links blind hearts to inability to reason. Sunnah links sound heart to sound body. Both point to same: your inner state shapes outer health and behaviour.
Nurturing Qalb through dhikr, purification, love, piety is not just spiritual nice-to-have — it has measurable cognitive benefits. Positive emotions leading to coherent heart rhythm improves attention, memory, reasoning. And diseased heart — hard, sealed, rusted from sins — impairs understanding, spiritual blindness.
Modern research keeps finding heart influences brain more than thought. That invites us to take heart seriously — not just as pump, but as centre that needs care. Dhikr, gratitude, tawbah, good company — all polish the mirror of heart so divine knowledge reflects clearly.
My takeaway
Heart as "thinking" in Islam is about moral and spiritual intelligence — discerning truth, intention, faith. Brain's thinking is logical processing. Heart as physical organ in science influences brain physiologically to enable that. Pure heart → coherent rhythm → clearer brain → better decisions → more pure heart — feedback loop.
So work on both — keep heart soft with remembrance, keep brain sharp with learning, and let heart be driver and brain be good accomplice. That's holistic human Islam has always taught.
May Allah give us sound hearts that reason, remember and return to Him. Ameen.
Simple notes from Quran and Sunnah on Qalb and modern neurocardiology — personal understanding, please verify.
Written in Kathmandu • If this made you think about your own heart, share it.
I often was thinking why there is heart mention in the place of mind. Now I got my answer.
ReplyDeleteThanks for the read!
DeleteMashaAllah
ReplyDelete