Can Your Mind Become Immortal? Al-Fārābī's Journey of the Intellect
Where Does Everything Come From? A Night in Baghdad
Close your eyes and imagine a world lit only by oil lamps and blazing stars. In Baghdad, around the year 900 CE, a thinker named Abū Nasr al-Fārābī (c. 870–950 CE) would gaze at the night sky and ask: where did all this come from? Not just the stars — where did life itself come from, and what is the thinking thing inside you?
Al-Fārābī built a grand picture of reality, a blueprint of how existence flows like light from a single lamp. He called this process emanation (fayḍ). At the very top sits the First Existent, a being that is perfect, eternal, immaterial, and entirely one. It is not just a thing — it is a pure intellect, thinking itself. From this First Cause, existence overflows without the First Cause losing anything, like a flame giving off light that never dims the flame.
The First Existent gives rise to a chain of second intellects, each one producing a celestial sphere — the highest heaven, the sphere of the fixed stars, then Saturn, Jupiter, Mars, the sun, Venus, Mercury, and the moon. These intellects are immaterial, not in any body. The tenth and last in the chain is the active intellect, the one that governs our world below the moon and — most importantly — lights up your mind.
What Is a Soul? The Hidden Shape of Your Body
Al-Fārābī followed Aristotle’s idea that the soul is the form of a living body — the actualizing principle that makes a hunk of matter into a thriving creature. Think of a lump of wax shaped into a seal: the shape is the form, and without it, the wax is just wax. For al-Fārābī, your soul is what turns a pile of physical stuff into a breathing, feeling, thinking human being.
Every living thing has a soul that gives it faculties. Plants have the nutritive faculty; animals add sensation and desire; humans possess all those plus the rational faculty, the intellect. But where does the soul reside? Al-Fārābī made a surprising claim: the ruling organ is the heart. He believed the heart is the source of innate heat, the vital spark that spreads through the blood and keeps you alive. The brain, to him, is a secondary organ, a sort of cooling system that helps regulate the heat. All other faculties — nutrition, sensation, imagination, appetite, reason — are ruled from the heart, which sends its commands through the nerves and blood like a king issuing orders to distant provinces.
He even explained how a new human being forms. The father’s contribution, he said, is like rennet — the stuff that curdles milk — while the mother’s matter is like the milk. When they meet, the first thing to arise is the heart, and only then do all the other organs grow around it. So from the very start, a heart-centered soul shapes a body into a living person.
The Powerful Imagination: Dreams that Touch the Divine
Your imagination doesn’t just replay memories like a fuzzy video. Al-Fārābī saw the imaginative faculty as far more active: it stores the impressions from your senses, then combines them, splits them, and even imitates things that aren’t made of sense-stuff at all. He called this power mimesis — reproduction through imitation.
When you’re awake, the imagination feeds the rational faculty with images. But when you sleep, the senses rest and the rational part quiets down. That’s when the imagination starts working on its own, mixing stored impressions into wild new forms. More remarkably, it can imitate intelligible truths — things that belong to the realm of pure thought — by dressing them up in sensory costumes. A feeling of hope might appear as a brilliant sun, a hard mathematical truth as a solid, shining cube.
For most people, this happens only in dreams. But a very few individuals, al-Fārābī believed, receive a direct flow from the active intellect even while awake. Their imagination becomes so powerful that it can translate transcendent truths into visions of glorious beings or previews of future events. In this way, philosophical prophecy becomes thinkable — not as a miracle that breaks the laws of nature, but as the highest reach of a human faculty that everyone possesses in a smaller way.
The Intellect’s Climb: From Wax to Light
Now we come to the heart of al-Fārābī’s big idea: the journey of the intellect. He borrowed the framework from the ancient commentators on Aristotle, especially Alexander of Aphrodisias, and turned it into a ladder of four steps.
At birth, your rational faculty is a potential intellect (also called material or passive intellect) — it’s like a blank wax tablet, able to receive forms but empty. The forms of things — what makes a horse a horse, a triangle a triangle — are out there in material objects, mixed up with matter. The potential intellect can’t do anything with them yet.
The active intellect, that tenth cosmic intellect, works on your potential intellect like the sun works on sight. It illuminates it so that the intellect can abstract the forms from matter and receive them as intelligibles — pure concepts. When that happens, your potential intellect becomes an actual intellect. At this stage, the form and the intellect are one: what you understand is your understanding. A horse-shaped thought fills the wax.
But the climb doesn’t stop there. Once your actual intellect holds many intelligibles, it can turn inward and think about its own thinking without constantly needing new sense impressions. It becomes the acquired intellect, capable of grasping forms that exist entirely separate from matter — the highest realities, including the active intellect itself. And here is the startling claim: the acquired intellect gradually becomes a separate substance, no longer dependent on the body. At that point, al-Fārābī says, you achieve happiness (saʿādah) and your true self lives on after the body perishes. Your mind has made itself a star.
Why Absolute Certainty Is So Hard to Get
You know lots of things: your name, your favorite food, that three plus four is seven. But do you know that you know with no room for a single flicker of doubt? Al-Fārābī reserved the term certainty (yaqīn) for a very special kind of knowledge — the sort that cannot be false at any time, in any world, no matter what.
He listed six conditions for absolute certainty. It’s not enough to believe something true, or even for it to be true. You must: (1) believe it as it is; (2) it must really be that way; (3) you must know that it corresponds to reality; (4) it must be impossible for it to be otherwise; (5) it must never be false at any moment; and (6) conditions 1–5 must hold because of what the thing is, not by accident. In short, you need second-order knowledge: the knower must know that she knows, and know that it couldn’t be any other way.
This kind of certainty, al-Fārābī argued, can only come from demonstration, the highest of the logical arts. Demonstration builds on necessary, universal premises — like “the whole is greater than the part” — and proceeds by strict reasoning to conclusions that inherit the same diamond-solid certainty. Other ways of arguing — rhetoric, poetry, even clever debate — can produce belief or opinion, but not the unshakable knowledge that the ancients called science. For al-Fārābī, the crown of human life is to climb the ladder of the intellect until your mind reaches that state of pure knowing, sharing the quality of the eternal active intellect that lit the candle in the first place.
Think about it
- If your heart were replaced by a machine that kept your body alive exactly as before, would you still be the same you? Why might al-Fārābī’s account of the soul make that a strange question?
- Can you think of something you know with such certainty that you cannot even imagine it being false? What would it take to prove you wrong?
- When a dream feels vivid and meaningful, how do you decide whether it came from your own memories, your imagination, or something beyond you?
