The Quran calls us to think: The Quran uses the word 'Aql (reason, intellect) in over 50 verses — always as a call to use it, never to switch it off: "Do you not reason? Do you not reflect? Do you not remember?" Islam is the religion that commands its followers to think.
Two proofs from Allah: Imam Ja'far al-Sadiq (as) said that Allah has two proofs upon people — an outer proof, which is the Prophet and the Imams, and an inner proof, which is reason ('Aql). Reason is not just a human tool; it is a Divine proof, as authoritative as prophethood itself.
Reason and revelation agree: In Shia Kalam, 'Aql (reason) and Naql (transmitted revelation) are both authoritative — and they never truly contradict each other. If they seem to clash, we have misunderstood one of them. The answer is always deeper understanding, never throwing one away. They work together, like two wings of a bird.
Good and evil are real: Reason can know, all by itself, that justice is good and oppression is evil — before any command is given. This is Husn wa Qubh 'Aqli: good and evil are objective rational facts. They exist before any Divine command, and Allah's commands agree with them because His nature is perfectly good.
The opposite view: The Ash'ari school said good is only what Allah commands, and evil only what He forbids — so if Allah commanded cruelty, cruelty would be "good". Shia Kalam disagrees: if good were only a command, the whole rational basis of ethics — and of prophethood itself — would collapse.
Example
A small child who has never been told the rule still knows it is wrong to snatch a classmate's lunch. No one taught her the rule, yet her reason already knows it. That is Husn wa Qubh 'Aqli: some things are wrong in themselves, and reason can see it before any teacher speaks.
Key Terms
- 'Aql (عقل) — reason, intellect; the inner proof of Allah
- Hujja (حجت) — a proof; an authority that Allah has set over people
- Husn wa Qubh 'Aqli (حسن و قبح عقلی) — rational good and evil; good and evil as objective facts reason can know
- Naql (نقل) — transmitted revelation; what has come down to us from the Quran and the Prophet (SAW)
Quran or Hadith
Hadith of Imam Ja'far al-Sadiq (as): "Allah has two proofs upon people — an outer proof which is the Prophet and the Imams — and an inner proof which is reason ('Aql)." — Al-Kafi, Vol. 1. — to be checked.
The Quran repeats the call "Do you not reason?" in many verses — e.g. "Do you not reason? Do you not reflect? Do you not remember?" — to be checked.
Fresh diagram to be drawn: A bird with two wings labelled "'Aql — Reason" and "Naql — Revelation", flying together, with the caption "Two proofs, one flight".
- The Quran calls us to use reason in over 50 verses — never to switch it off.
- Allah has two proofs: the outer proof (the Prophet and the Imams) and the inner proof (reason).
- Reason and revelation never truly contradict each other.
- Justice is good and oppression is evil — reason knows this by itself, before any command.