Iqbal recovers the Qur'anic Qalb (heart) as a regular faculty of knowing alongside hearing and sight — not a mystical add-on but a demystified mode of perception. Religious experience, he argues, is a fact among facts and deserves the same critical attention as any other; the Prophet himself, in the Ibn Sayyād episode, was 'the first critical observer of psychic phenomena.'
Section 5 ended with the epistemological sentence — 'knowledge is sense-perception elaborated by understanding' — and built a Qur'anic portrait of the universe as dynamic, open, and oriented toward action. Section 6 picks up that thread but widens it. If knowledge requires sense-perception, then what mode of perception is it? Section 6's central move is to recover what the Qur'an itself calls Fu'ād or Qalb — the heart — as a faculty of knowing that operates alongside hearing and sight, and to argue that this faculty, properly understood, is not mystical obscurantism but the most demystified mode of perception in Iqbal's entire epistemology. Along the way, Section 6 contains Iqbal's first explicit articulation of the claim he will defend at full length in Lecture V — that the Qur'an's empirical orientation produced the cultural disposition out of which modern science was born — and one of the most extraordinary passages in the lecture: the argument that the Prophet of Islam was 'the first critical observer of psychic phenomena.'
Iqbal opens by extending Section 5's argument. The 'reflective observation of Nature' the Qur'an demands is directed toward awakening 'consciousness of that of which Nature is regarded a symbol' — but its practical effect has been historically immense. 'The general empirical attitude of the Qur'an...engendered in its followers a feeling of reverence for the actual and ultimately made them the founders of modern science.' This is the claim Iqbal will develop at full length in Lecture V; he plants it here in passing as evidence for the broader epistemological argument. The phrase 'reverence for the actual' is the key — the opposite of Plato's contempt for appearances diagnosed in Section 2, a cultural disposition that takes what is actually there as worthy of attention, observation, and study. Reflective contact with 'the temporal flux of things,' Iqbal argues, is not a distraction from knowledge of the non-temporal but the training that makes it possible. 'Reality lives in its own appearances; and such a being as man, who has to maintain his life in an obstructing environment, cannot afford to ignore the visible.' Iqbal then issues one of the section's sharpest verdicts on civilisational failure: 'The cultures of Asia and, in fact, of the whole ancient world failed, because they approached Reality exclusively from within and moved from within outwards. This procedure gave them theory without power, and on mere theory no durable civilization can be based.' The phrase theory without power is one of the most consequential in the Reconstruction's diagnosis of civilisational failure — a culture that can explain reality but cannot change it, that has insight but no infrastructure, that produces wisdom but not institutions. The contrast with the empirical, world-engaging orientation Iqbal attributes to the Qur'an is exact.
Iqbal then makes a claim he describes as historical but which is in fact philosophically radical. 'The treatment of religious experience, as a source of Divine knowledge, is historically prior to the treatment of other regions of human experience for the same purpose.' Religion got there first; science came later. But the Qur'an, 'recognizing that the empirical attitude is an indispensable stage in the spiritual life of humanity, attaches equal importance to all the regions of human experience as yielding knowledge of the Ultimate Reality which reveals its symbols both within and without.' The phrase 'equal importance to all the regions of human experience' is Iqbal's quiet declaration of an epistemological democracy: no single mode of knowing has a monopoly on truth. The scientist studying the heavens, the philosopher reasoning about causality, the mystic in contemplation, the ordinary person reflecting on the day-night cycle — all are engaged in the same fundamental activity of reading God's signs. Iqbal then names the two paths through which this knowledge is gathered: 'reflective observation and control of [reality's] symbols as they reveal themselves to sense-perception' (the path of empirical inquiry) and 'direct association with that reality as it reveals itself within' (the path of inner experience). Both are legitimate; both yield knowledge; neither is sufficient alone.
The section's most philosophically delicate move comes next. The Qur'an's 'naturalism' — its endorsement of human engagement with the natural world — is qualified with a sharp ethical condition: nature is to be exploited 'not in the interest of unrighteous desire for domination, but in the nobler interest of a free upward movement of spiritual life.' This separates Iqbal's position from the Baconian tradition (knowledge as conquest of nature for 'the relief of man's estate') and from the modern technocratic disposition that treats mastery as an end in itself. The Qur'anic concept here is taskhīr — the 'subjection' of nature to human purposes within a framework of khilāfa, divine stewardship. The moment mastery becomes its own end, it becomes 'unrighteous domination.' Iqbal then turns to the section's central concept. 'In the interests of securing a complete vision of Reality, sense-perception must be supplemented by the perception of what the Qur'an describes as Fu'ād or Qalb, i.e. heart.' The verse he cites is 32:7–9: God shaped man, 'breathed of His spirit unto him, and gave you hearing and seeing and heart.' The three faculties are paired in a single sentence in the Qur'an itself — hearing, sight, and the heart, all three given by God for the same purpose: the perception of reality. The heart is not a mystical add-on to be invoked when ordinary perception fails. It is one of the basic instruments of human knowing, given alongside the senses, with equal standing.
Iqbal then takes pains to demystify the heart. He first quotes Rūmī — the same poet he cited in Section 1 as the warning voice against intellect — but here in a different mode: not as the critic of reason but as the poet of the heart's cognitive power. The heart, in Rūmī's image, 'feeds on the rays of the sun and brings us into contact with aspects of Reality other than those open to sense-perception.' But Iqbal is immediately careful to discipline the poetry. 'We must not, however, regard it as a mysterious special faculty; it is rather a mode of dealing with Reality in which sensation, in the physiological sense of the word, does not play any part.' This is Iqbal the philosopher restraining Iqbal the poet. The heart is not occult, not magical, not the possession of a spiritual elite. It is a human capacity available to anyone willing to attend to aspects of experience that the five senses cannot capture — moral intuition, the apprehension of beauty, the experience of meaning, the direct awareness of the divine. 'Yet the vista of experience thus opened to us is as real and concrete as any other experience.' Iqbal then makes a striking observation about the language we use for such experience. 'To describe it as psychic, mystical, or super-natural does not detract from its value as experience. To the primitive man all experience was super-natural.' What we now call 'Nature' emerged through the gradual interpretation of experiences that were initially as strange as religious experience; the categorisation of some experiences as natural and others as supernatural is itself a historical achievement, and it does not foreclose the possibility of further regions of experience that interpretation has not yet domesticated. Iqbal's language for how this happens is striking: the 'total-Reality' has 'other ways of invading our consciousness.' Note the verb. Reality invades. The mystic does not go looking for God; reality breaks in. This is not the language of human agency but of something that happens to the knower — and it is one of Iqbal's most important rhetorical moves, because it protects religious experience from both the sceptic (who calls it projection) and the enthusiast (who claims it can be produced on demand).
The section's epistemological climax follows. 'There seems to be no reason, then, to accept the normal level of human experience as fact and reject its other levels as mystical and emotional. The facts of religious experience are facts among other facts of human experience and, in the capacity of yielding knowledge by interpretation, one fact is as good as another.' This is a quiet bomb. Religious experience, as a source of knowledge, has exactly the same epistemic status as any other form of experience. It is not inferior to scientific observation. It is not superior to rational analysis. It is a fact among facts — and 'one fact is as good as another.' The immediate consequence is decisive: religious experience can and must be critically examined, just as scientific data can and must be. Criticism is not irreverence; it is the only way to separate the genuine from the counterfeit. Iqbal then offers, as concrete evidence that the Islamic tradition itself has always understood this, the most extraordinary illustration in the lecture: 'The Prophet of Islam was the first critical observer of psychic phenomena.' The story comes from Bukhārī and Muslim. Ibn Sayyād was a Jewish youth in Medina whose ecstatic moods attracted the Prophet's attention. The Prophet did not condemn him, did not exorcise him, did not pass theological judgement on him. He investigated. He 'tested him, questioned him, and examined him in his various moods.' He even concealed himself behind a tree to observe the boy's behaviour without the distortion that his presence might introduce — a rudimentary form of controlled observation. When the boy's mother interrupted by warning her son and the spell was broken, the Prophet's frustration was telling: 'If she had let him alone the thing would have been cleared up.' The Prophet wanted to understand. This is the attitude of a researcher, not a priest.
Iqbal then makes the move that turns the Ibn Sayyād episode from anecdote into argument. 'The Prophet's companions, some of whom were present during the course of this first psychological observation in the history of Islam, and even later traditionists, who took good care to record this important fact, entirely misunderstood the significance of his attitude and interpreted it in their own innocent manner.' The data was preserved; the meaning was missed. This is the same pattern Iqbal has been diagnosing throughout the lecture — the Qur'an's anti-classical orientation, missed for two hundred years (Section 2); the Prophet's empirical disposition, missed for over a thousand. The tradition is not lacking in resources; it has failed to read its own resources with the seriousness they deserve. Iqbal then cites the orientalist Duncan Black Macdonald, who finds 'humour enough in this picture of one prophet trying to investigate another after the method of the Society for Psychical Research.' Macdonald's failure of imagination — the inability to conceive that the empirical spirit might have non-European origins — is itself a small monument to the assumptions that have shaped Western Islamic studies. But Iqbal is generous in the same paragraph: 'the first Muslim to see the meaning and value of the Prophet's attitude was Ibn Khaldūn, who approached the contents of mystic consciousness in a more critical spirit and very nearly reached the modern hypothesis of subliminal selves.' The reference is to the analytical psychology of altered states that William James would later develop in The Varieties of Religious Experience (1902); Iqbal is claiming that Ibn Khaldūn anticipated the analysis by half a millennium. The pattern is now familiar — and devastating — as a recurring motif in the Reconstruction: a Muslim thinker anticipates a Western development by centuries; the Muslim world does not follow up; the work is left to others. Even Macdonald himself, Iqbal notes drily, conceded that Ibn Khaldūn 'would probably have been in close sympathy with Mr. William James's Varieties of Religious Experience.'
The section ends on an unexpected note of intellectual modesty. 'Modern psychology has only recently begun to realize the importance of a careful study of the contents of mystic consciousness, and we are not yet in possession of a really effective scientific method to analyse the contents of non-rational modes of consciousness.' This admission — that the scientific tools needed to evaluate religious experience are still being developed — protects Iqbal from the apologetic move he criticises elsewhere. He is not claiming that science has already validated religion. He is claiming that religion deserves the same critical attention as any other domain of experience, and that the work of bringing the appropriate critical methods to bear is still in its early stages. 'With the time at my disposal it is not possible to undertake an extensive inquiry into the history and the various degrees of mystic consciousness in point of richness and vividness. All that I can do is to offer a few general observations only on the main characteristics of mystic experience.' That is exactly what Section 7 will deliver — the longest section in Lecture I, with twenty-two annotations — in which Iqbal sets out the characteristics of religious experience and confronts head-on the reductionist explanations (Freud's, the materialists') that would dismiss it as illusion. Section 6 has prepared the ground by establishing that religious experience is a legitimate domain of inquiry; Section 7 will conduct the inquiry itself.
‘God hath made everything which He hath created most good; and began the creation of man with clay; then ordained his progeny from germs of life, from sorry water; then shaped him, and breathed of His spirit unto him, and gave you hearing and seeing and heart: what little thanks do ye return?’ (32:7–9).— Surah as-Sajdah (32:7–9)