(Iqbal’s observations on Mystic Experience)
The mystic’s intimate association with the eternal which gives him a sense of the unreality of serial time does not mean a complete break with serial time. The mystic state in respect of its uniqueness remains in some way related to common experience. This is clear from the fact that the mystic state soon fades away, though it leaves a deep sense of authority after it has passed away. Both the mystic and the prophet return to the normal levels of experience, but with this difference that the return of the prophet, as I will show later, may be fraught with infinite meaning for mankind.
For the purposes of knowledge, then, the region of mystic experience is as real as any other region of human experience and cannot be ignored merely because it cannot be traced back to sense-perception. Nor is it possible to undo the spiritual value of the mystic state by specifying the organic conditions which appear to determine it. Even if the postulate of modern psychology as to the interrelation of body and mind is assumed to be true, it is illogical to discredit the value of the mystic state as a revelation of truth.
Psychologically speaking, all states, whether their content is religious or non-religious, are organically determined. The scientific form of mind is as much organically determined as the religious. Our judgment as to the creations of genius is not at all determined or even remotely affected by what our psychologists may say regarding its organic conditions.
A certain kind of temperament may be a necessary condition for a certain kind of receptivity; but the antecedent condition cannot be regarded as the whole truth about the character of what is received. The truth is that the organic causation of our mental states has nothing to do with the criteria by which we judge them to be superior or inferior in point of value.
Summarized from Reconstruction of Religious Thought in Islam. pg 20,21
Note: Iqbal says that although the mystic experience ceases after a while, it leaves deep impressions on the mind of the person.