The Fourth Islamic century marked a decisive turning point in the evolution of Islamic intellectual thought. Under Abbasid patronage, the systematic translation of Greek philosophical literature into Arabic brought the works of Plato, Aristotle, Plotinus, and other Hellenistic philosophers into the Islamic intellectual tradition. This transmission of knowledge introduced sophisticated philosophical and metaphysical concepts that had previously been unknown to the formative generations of Muslim scholars, thereby contributing significantly to the development of later Islamic philosophy and mysticism (Fakhry, 2004).
The intellectual legacy of the Greek translation movement was not confined to Muslim philosophers such as al-Fārābī and Ibn Sīnā; it also left a discernible imprint on the writings of certain later Sufis. This development marked a shift in the articulation of mystical experience, as Qur'anic modes of expression were progressively complemented—and in some instances replaced—by philosophical terminology influenced by Neoplatonic thought and related traditions.
Alexander Knysh (2017) notes that Islamic mysticism gradually developed a sophisticated metaphysical vocabulary that often went beyond the language of revelation. Similarly, William Chittick (1989) observes that Ibn ʿArabī's writings represent one of the most elaborate metaphysical systems in Islamic intellectual history.
From a historical perspective, this shift reflected an intellectual attempt to interpret mystical experience through philosophical reasoning. However, from the perspective of Sunni orthodoxy, many scholars expressed reservations regarding both the necessity and the religious legitimacy of employing philosophical constructs to explain spiritual realities. The Qur'an had already defined the relationship between Allah and His creation with remarkable clarity: "There is nothing whatsoever like unto Him." (Qur'an 42:11) And "Say: He is Allah, the One... There is none comparable to Him." (Qur'an 112:1–4)
These verses simultaneously affirm Allah's transcendence (tanzīh) and uniqueness while avoiding speculative discussions concerning the ontology of existence. The Qur'an deliberately leaves many metaphysical questions unanswered because they belong to the unseen known only to Allah. Consequently, classical Sunni scholars argued that revelation provides sufficient guidance concerning Allah's nature without requiring philosophical elaboration.
Philosophy and the Limits of Human Reason
Islam acknowledges reason (ʿaql) as an indispensable faculty for acquiring knowledge and understanding the observable order of creation. Accordingly, the Qur'an repeatedly invites human beings to reflect, deliberate, and contemplate the signs of Allah in the cosmos. However, Islamic epistemology does not regard reason as an independent or unrestricted source of knowledge. Its function remains subordinate to revelation, particularly in matters concerning the unseen (al-ghayb). Accordingly, realities such as Allah's Essence (dhāt), His attributes (ṣifāt), divine predestination, the nature of the soul, Paradise, Hell, angels, and other metaphysical entities cannot be established through philosophical speculation alone but are known only through authentic divine revelation.
The Qur'an explicitly states: "They ask you concerning the soul. Say: the soul is of the affair of my Lord, and you have been given only a little knowledge." (Qur'an 17:85)
This verse illustrates an important epistemological principle. Human reason has genuine value but also definite limits. Once revelation has spoken, philosophical speculation cannot supersede it.
It is precisely here that many Sunni theologians locate the central problem of speculative Sufism. They argue that later metaphysical doctrines sought to answer questions that revelation intentionally left unanswered.
Revelation as the Ultimate Criterion
The Qur'an repeatedly presents itself as al-Furqān, the criterion separating truth from falsehood.
Allah says: "Blessed is He Who sent down the Criterion upon His servant." (Qur'an 25:1). Likewise,
"If you differ over anything, refer it to Allah and His Messenger." (Qur'an 4:59)
These verses establish revelation—not mystical experience—as the ultimate arbiter of religious truth. Ibn Taymiyyah repeatedly emphasised that genuine spiritual unveiling (kashf) may occur to righteous believers, but it remains fallible because it is a human experience rather than divine revelation. Consequently, mystical intuition can neither establish doctrine nor abrogate explicit scriptural teachings (Majmūʿ al-Fatāwā).
This distinction profoundly shaped the Sunni understanding of spirituality. The saints (Awliyāʾ) are honoured not because they receive independent knowledge but because they faithfully embody revelation.
The Qur'an defines the friends of Allah in remarkably simple terms: "Indeed, the friends of Allah shall have no fear, nor shall they grieve—those who believe and are mindful of Allah." (Qur'an 10:62–63)
Notably, the Qur'an does not associate sainthood with metaphysical insight, miraculous powers, or esoteric doctrines. Rather, faith (īmān) and God-consciousness (taqwā) constitute its defining characteristics.
Transition:
The emergence of philosophical mysticism gave rise to several influential doctrines, including Waḥdat al-Wujūd, Waḥdat al-Shuhūd, ḥulūl, ittiḥād, and ecstatic utterances such as "Ana al-Ḥaqq." These doctrines have generated intense debate for centuries.
1. A Critical Evaluation of Speculative Sufi Doctrines
Having affirmed the Qur'an and the Sunnah as the supreme authorities in matters of Islamic belief and spirituality, the subsequent analysis focuses on the major metaphysical doctrines associated with later Sufi thought. This discussion does not seek to question the authenticity of the spiritual experiences or the sincerity of individual mystics. Rather, its purpose is to examine whether these doctrinal formulations possess a clear foundation in divine revelation. From the methodological standpoint adopted in this thesis, mystical experiences are subjective and therefore cannot function as autonomous sources of theological knowledge. Instead, the legitimacy of all spiritual and doctrinal claims must ultimately be determined by their conformity with the Qur'an and the authentic Sunnah.
2. Waḥdat al-Wujūd (The Unity of Being)
Among the most influential doctrines in later Sufi metaphysics is Waḥdat al-Wujūd, generally associated with Muḥyī al-Dīn Ibn ʿArabī (d. 638/1240), although the exact phrase is more commonly used by his later followers. Its interpreters have understood it in different ways. Some maintain that it signifies only that Allah alone possesses absolute existence and that creation exists only through His sustaining will. Others have articulated it in ways that appear to collapse the ontological distinction between the Creator and creation. From the standpoint of normative Sunni theology, the central concern is not the intention of every interpreter but the language employed and the theological implications that may arise from it. The Qur'an repeatedly affirms two complementary truths: Allah is transcendent (tanzīh) and near to His creation, yet He remains categorically distinct from it.
Allah declares: "There is nothing whatsoever like unto Him, and He is the All-Hearing, the All-Seeing." (Qur'an 42:11)
Likewise,
"Say: He is Allah, the One... There is none comparable to Him." (Qur'an 112:1–4)
These verses establish an inviolable distinction between the Creator and creation. While Allah's knowledge, power, and mercy encompass all things, the Qur'an nowhere suggests that created existence is ontologically identical with the Divine Essence. Rather, Allah remains eternally unique, self-sufficient, and utterly unlike His creation. Ibn Taymiyyah argued that formulations implying an identity of being between Allah and creation undermine the Qur'anic conception of tawḥīd by obscuring the distinction between the Necessary Being (Allah) and contingent beings (creation) (Majmūʿ al-Fatāwā, vol. 2). Ibn al-Qayyim similarly criticised expressions that could be understood as erasing this distinction, maintaining that true monotheism requires affirming both Allah's transcendence and His immanence as described in revelation, without philosophical reinterpretation (Madarij al-Sālikīn).
It should be noted, however, that many contemporary interpreters of Ibn ʿArabī reject the accusation of pantheism, arguing that his doctrine has often been misunderstood and that he sought to preserve divine transcendence while expressing the dependence of all creation upon God. Nevertheless, from the perspective of this paper, such metaphysical constructions remain speculative and cannot be elevated to the level of Islamic creed because neither the Qur'an nor the Sunnah formulates tawḥīd in these philosophical terms.
3. Waḥdat al-Shuhūd (The Unity of Witnessing)
In the eleventh/seventeenth century, Shaykh Aḥmad Sirhindī (d. 1034/1624), known as the Mujaddid Alf-i Thānī, proposed Waḥdat al-Shuhūd as a corrective to Waḥdat al-Wujūd. According to Sirhindī, the experience of unity belongs to the mystic's perception rather than to objective reality. In other words, the seeker, overwhelmed by the remembrance of Allah, perceives only the Divine and becomes oblivious to everything else, but the distinction between Creator and creation remains intact.
From the standpoint of Sunni theology, Waḥdat al-Shuhūd avoids some of the ontological difficulties associated with Waḥdat al-Wujūd. Nevertheless, it remains an attempt to conceptualise mystical experience through philosophical language. Neither the Qur'an nor the Sunnah presents such a doctrine as a component of Islamic belief. Consequently, while it may be viewed as a description of a particular spiritual state, it cannot be regarded as a revealed doctrine binding upon Muslims. The distinction is methodologically significant. Revelation defines the content of faith, whereas mystical psychology describes the subjective experience of individual believers. The latter cannot become a source of doctrine.
4. Ḥulūl (Divine Indwelling) and Ittiḥād (Union)
Perhaps the most controversial doctrines attributed to certain mystical circles are ḥulūl (the indwelling of God in a human being) and ittiḥād (essential union between the servant and the Divine). These concepts have generally been rejected by mainstream Sunni theologians because they appear to compromise the absolute transcendence of Allah.
The Qur'an unequivocally teaches that Allah is distinct from His creation. While He is "closer to man than his jugular vein" (Qur'an 50:16) in terms of His knowledge, power, and oversight, this nearness does not imply physical indwelling or ontological union. Classical exegetes consistently interpreted such verses in a manner that preserves Allah's transcendence while affirming His intimate knowledge of His servants.
Ibn Kathīr, commenting on such verses, explains that Allah's nearness refers to His complete knowledge and awareness, not to incarnation or indwelling (Tafsīr Ibn Kathīr). Likewise, alṬabarī and al-Qurṭubī reject interpretations that compromise the Creator-creature distinction. From this perspective, any doctrine suggesting that Allah literally indwells His creation or becomes united with it stands in conflict with the Qur'anic doctrine of tawḥīd. Such ideas bear closer resemblance to certain strands of Neoplatonic, Gnostic, or Christian mystical speculation than to the explicit teachings of the Qur'an and the Sunnah.
5. Shaṭaḥāt and the Statement "Ana al-Ḥaqq"
Among the most famous ecstatic utterances in Islamic history is al-Ḥallāj's declaration: "Ana al-Ḥaqq" ("I am the Truth").
Sufi interpreters have generally understood this statement as an expression uttered during a state of mystical intoxication (sukr), in which the servant becomes so overwhelmed by the remembrance of Allah that ordinary self-consciousness is eclipsed. They argue that such utterances should not be interpreted literally as theological propositions. Classical Sunni scholars, however, adopted differing approaches. Some accepted that the statement reflected an ecstatic condition but maintained that such expressions should neither be repeated nor presented as normative teachings. Others viewed the statement as unacceptable because its apparent meaning contradicts the exclusive divine name al-Ḥaqq, which belongs to Allah alone (Qur'an 22:6).
Ibn Taymiyyah adopted a nuanced position. He distinguished between a person who utters problematic words while deprived of full rational awareness and one who deliberately formulates theological doctrines based on such experiences. While recognising that genuine spiritual ecstasy may occur, he insisted that no mystical state can override or redefine the teachings of revelation. Spiritual experiences may excuse an individual in certain circumstances, but they cannot establish religious truth (Majmūʿ al-Fatāwā, vols. 2 & 10). This distinction remains crucial. Islam acknowledges extraordinary spiritual experiences, dreams, and states of profound devotion, but it never accords them the epistemological authority of revelation. The Qur'an remains the final criterion (al-Furqān), against which all claims—whether rational, mystical, or experiential—must be measured.
6. Kashf (Mystical Unveiling) as a Source of Knowledge
Another significant issue concerns kashf, the belief that saints may receive direct spiritual unveiling or intuitive knowledge. Many Sunni scholars accepted that Allah may grant believers true insight (firāsah) or illuminate their hearts through sincere faith and obedience. However, they carefully distinguished such experiences from prophetic revelation. The Prophet صلى الله عليه وسلم is the Seal of the Prophets (Qur'an 33:40). With the completion of revelation, no subsequent mystical experience can introduce new doctrines, modify the Sharīʿah, or establish beliefs independently of the Qur'an and the Sunnah. Accordingly, Ibn al-Qayyim writes that any spiritual unveiling that contradicts revelation is necessarily false, regardless of the sincerity of the individual experiencing it (Madarij alSālikīn). Genuine inspiration (ilhām) may encourage personal righteousness, but it possesses no legislative or doctrinal authority.