How the perfect man reaches this height of spiritual development, the author does not tell us; but he says that at every stage he has a peculiar experience in which there is not even a trace of doubt or agitation. The instrument of this experience is what he calls the _Qalb_ (heart), a word very difficult of definition. He gives a very mystical diagram of the Qalb, and explains it by saying that it is the eye which sees the names, the attributes and the Absolute Being successively. It owes its existence to a mysterious combination of soul and mind; and becomes by its very nature the organ for the recognition of the ultimate realities of existence. All that the "heart", or the source of what the Vedānta calls the Higher Knowledge, reveals is not seen by the individual as something separate from and heterogeneous to himself; what is shown to him through this agency is his own reality, his own deep being. This characteristic of the agency differentiates it from the intellect, the object of which is always different and separate from the individual exercising that faculty. But the spiritual experience, according to the Ṣūfīs of this school, is not permanent; moments of spiritual vision, says Matthew Arnold,[170:1] cannot be at our command. The god-man is he who has known the mystery of his own being, who has realised himself as god-man; but when that particular spiritual realisation is over man is man and God is God. Had the experience been permanent, a great moral force would have been lost and society overturned. [170:1] "We cannot kindle when we will The fire which in the heart resides". Let us now sum up Al-Jīlī's _Doctrine of the Trinity_. We have seen the three movements of the Absolute Being, or the first three categories of Pure Being; we have also seen that the third movement is attended with external manifestation, which is the self-diremption of the Essence into God and man. This separation makes a gap which is filled by the perfect man, who shares in both the Divine and the human attributes. He holds that the perfect man is the preserver of the Universe; hence in his view, the appearance of the perfect man is a necessary condition for the continuation of nature. It is easy, therefore, to understand that in the god-man, the Absolute Being which has left its absoluteness, returns into itself; and, but for the god-man, it could not have done so; for then there would have been no nature, and consequently no light through which God could have seen Himself. The light through the agency of which God sees Himself is due to the principle of difference in the nature of the Absolute Being itself. He recognises this principle in the following verses:-- If you say that God is one, you are right; but if you say that He is two, this is also true. If you say no, but He is three, you are right, for this is the real nature of man.[171:1] [171:1] Insān al-Kāmil, Vol. I, p. 8.