The Five Foundational Principles
1. Tawhid (Divine Unity): The Mutazilites insisted that divine attributes (knowledge, power, will, life) could not be eternal alongside Allah — that would amount to multiple eternals. Therefore, Allah’s attributes must be understood as identical with His essence, not separable from it. The Quran was therefore created (not eternal) since it is divine speech, an attribute. This was their most explosive position.
2. ‘Adl (Divine Justice): Allah cannot do injustice. Since He is perfectly just, He must reward the obedient and punish the disobedient — He has, in a sense, obligated Himself to justice. This also requires human free will: punishment is only just if the human was genuinely free to choose. The Mutazilites were determined defenders of free will against the Jabriyya (determinists).
3. Al-Wa’d wa al-Wa’id (The Promise and the Threat): Allah’s promises of reward (wa’d) and threats of punishment (wa’id) are absolute. He cannot break them, even out of mercy. A Muslim who dies unrepentant of a grave sin will be punished — Allah’s mercy cannot override His justice in the permanent sense claimed by some other schools.
4. Al-Manzila bayn al-Manzilatayn (The Intermediate Position): The question that sparked the school’s founding — what is the status of a Muslim who commits a grave sin? Neither a believer in full nor an unbeliever: they occupy an intermediate position. They are neither counted among the saved nor expelled from the community.
5. Amr bi’l-Ma’ruf wa Nahy ‘an al-Munkar (Commanding Right and Forbidding Wrong): active obligation to promote justice, including through state power.
The Mihna: When the Mutazilites Won and Lost
Under Caliph al-Ma’mun (833 CE), the Mutazilite doctrine of the created Quran was imposed as state policy through a religious inquisition (mihna — ‘trial’). Scholars were tested on whether they accepted the doctrine; those who refused faced imprisonment. Ahmad ibn Hanbal famously refused and was imprisoned.
The Mutazilites held state power for approximately 20 years. The backlash when the policy was reversed under Caliph al-Mutawakkil (848 CE) permanently stigmatized them in Sunni circles. The Ash’ari and Maturidi schools — which both partially adopted Mutazilite methods while rejecting their positions — became the mainstream.
See also: Ilm Al Kalam, Tawhid Sifat, Falsafa Al Islamiyya, Hikmat Al Ishraq, Ilm Al Mizan, Sufi Stations Maqamat