ʿIlm al-Kalām Archive · Layer I · Quranic Ontology
حسن و قبح عقلي · The foundational kalām divide: can reason independently determine moral good and evil, prior to divine command?
The question of whether reason independently recognizes good (ḥusn) and evil (qubḥ) — prior to and independent of divine command — is the most foundational divide in Islamic ethical theology. The Muʿtazilī-Imami position: reason recognizes moral good and evil as objective features of acts, not merely as what God happens to command. The Ashʿarī position: moral status is entirely constituted by divine command — what God commands IS good, by definition, with no prior rational criterion. The stakes are maximum: if ḥusn/qubḥ are only revelational, then "divine justice" (ʿadl) is a tautology with no independent content. This is why ʿadl is the second pillar (uṣūl al-dīn) in Imami theology but not in Ashʿarī-Māturīdī theology: only the rationalist position makes justice a substantive theological claim.
Four Propositions
The dispute determines whether divine justice (ʿadl) is a meaningful theological category or a tautology. On the Ashʿarī position, "God is just" means nothing beyond "God acts as God acts" — there is no independent standard of justice by which God's acts can be evaluated; even if God punished the righteous and rewarded the wicked, this would be "just" because God willed it. The statement becomes vacuous. On the Muʿtazilī-Imami position, "God is just" carries substantive content: God acts in accordance with what reason recognizes as good and never acts in ways reason recognizes as evil (ẓulm). Divine justice is a real attribute with independent rational content — which is precisely why Imami theology makes ʿadl a distinct uṣūl al-dīn.
Moral recognition is built into human fiṭra (primordial nature) and is rationally accessible prior to and independent of received revelation. Q 91:7–8 calls this divinely inspired innate discernment (ilhām), not cultural convention. The Al-Kāfī hadith establishes ʿaql — the very faculty of rational moral recognition — as God's most beloved creation and the instrument through which divine reward and punishment are calibrated. This means rational moral knowledge (ḥusn/qubḥ ʿaqlī) is not a human innovation imposed on theology but is itself part of God's design — the Quranic and hadith evidence confirms the rationalist position rather than threatening it.
The Ashʿarī objection confuses omnipotence with arbitrariness. True omnipotence is not the ability to do logically self-contradictory things — God cannot create a square circle, not because He is weak but because "square circle" is incoherent. Similarly, "God does injustice" is an incoherent concept: divine injustice would contradict the divine essence (ʿadl is sifa dhātiyya). Al-Mufīd's formulation: God's not doing evil is an expression of perfection, not a limitation. Muṭahharī's point: the Ashʿarī god who COULD do injustice but chooses not to is actually less perfect than the Imami God whose very essence precludes it — the Ashʿarī position inadvertently produces a less perfect deity while claiming to defend divine omnipotence.
The five Imami uṣūl al-dīn (tawḥīd, ʿadl, nubuwwa, imāma, maʿād) include ʿadl as a distinct pillar precisely because Imami theology holds ḥusn/qubḥ ʿaqlī — divine justice has rational content that makes it a substantive, non-tautological claim about God's nature. Muṭahharī: this is the most important Imami theological contribution — preserving the meaningfulness of moral categories applied to God. The luṭf argument (from ʿadl to the necessity of the Imam — see LUTF-001 through LUTF-005) only works if divine justice is a real, evaluable attribute: God's justice REQUIRES the best possible guidance, which REQUIRES the Imam. On the Ashʿarī position, "God requires the Imam because God is just" would be empty. The entire structure of Imami theology — from ʿadl as pillar to luṭf as rational proof of imamate — depends on the rationalist position on ḥusn/qubḥ.
Cross-References