90 AN INTRODUCTION TO SUFI DOCTRINE the heaven which He built...?” (Quran LXXIX, 26). The microcosm, which corresponds to the Divine Name ““The Inner” (al-Batin) is perfect by its central nature. In the sight of the Essence, which is one, the universe is like a single being. The essential unity of the world is the most certain of things but also the most hidden : all knowledge and every perception, however adequate or inadequate, presupposes the essential Unity of beings and of things. If beings of different kinds perceive the universe differently according to differences in their perspective and in conformity with their level of universality, they none the less do perceive it really, for the reality of the universe cannot readily be dis- sociated from the reality of their vision and this reality is one although diverse in itsaspects ; itis simultaneously present in the subjects who know and in the objects known. Again, duality, and discontinuity are of the nature of the world ; to see the world means not to see the Essence; to contemplate the Essence means not to see the world. Among all the beings of this world man alone has a vision which in virtuality includes all things; other organic beings only have a partial vision of the world. Admittedly the direct and immediate content of human perception embraces only the surrounding corporeal world, but, on its own level of existence, this represents a relatively complete picture of the whole universe. Through sensory forms man conceives both subtle forms and spiritual essences. It may thus be said that man, who is a microcosm, and the universe, which is a macro-