Having secured that the ego is real, Iqbal turns to what it is, isolating two defining features: non-spatiality (mental states do not sit side by side in space; the ego can even generate multiple space-orders) and essential privacy (no one else — not even God — can feel, judge, or choose in my place). Together these establish that the ego cannot be reduced to the body and that its freedom is structurally inalienable.
Section 2 confronted the strongest modern Western case against the reality of the ego — Bradley's relational critique — and showed that even its proponent could not sustain the denial. The ego survived the critique not by resolving its internal contradictions but by proving undeniable: 'our feeling of egohood is ultimate.' But survival is not characterisation. To say that the ego is real is not yet to say what it is. Section 3 now moves from the question of the ego's reality to the question of its nature: what are the distinctive features that make the ego the kind of thing it is?
The section advances through two connected arguments, each isolating a characteristic that distinguishes mental reality from physical reality. The first argument concerns the ego's non-spatiality. Mental states — beliefs, desires, aesthetic responses — do not exist side by side in space the way parts of a material object do. You cannot locate one belief to the left of another. Your appreciation of the Tāj Mahal does not diminish with your distance from Āgra. The ego can even entertain multiple incompatible space-orders simultaneously: the space of waking experience and the space of dreams do not overlap or interfere with each other. From this non-spatiality, Iqbal draws a conclusion about time: the ego's duration is fundamentally different from physical duration. A physical event's history is 'stretched out in space' — it leaves marks, traces, residues — but these are only emblems of duration, not duration itself. True time-duration, the living experience of temporal flow, belongs to the ego alone.
The second argument concerns the ego's essential privacy. Iqbal demonstrates this through three examples that ascend in philosophical significance: the syllogism (inference requires that all premisses be held by a single mind), desire (the satisfaction of another's identical desire does not satisfy mine), and pain (the dentist cannot experience my toothache). The argument culminates in a theological claim of remarkable boldness: 'God Himself cannot feel, judge, and choose for me when more than one course of action are open to me.' The ego's privacy is not a deficiency to be overcome but a constitutive feature — the very thing that makes it an ego rather than an interchangeable component of a larger whole.
Together, these two arguments — non-spatiality and privacy — prepare the ground for the rest of Lecture IV. If the ego is non-spatial, then it cannot be reduced to the body (which is spatial). If the ego's duration is uniquely its own, then the physics of material time cannot exhaust the question of the ego's persistence. And if the ego is essentially private — so private that not even God can substitute for it — then the question of its freedom becomes urgent: a being whose inner life is impenetrable even to the Absolute is a being whose choices must be genuinely its own.