(2). The Accidental light (Attribute)—the light that has a form, and is capable of becoming an attribute of something other than itself (e.g. the light of the stars, or the visibility of other bodies). The Accidental light, or more properly sensible light, is a distant reflection of the Abstract light, which, because of its distance, has lost the intensity, or substance-character of its parent. The process of continuous reflection is really a softening process; successive illuminations gradually lose their intensity until, in the chain of reflections, we reach certain less intense illuminations which entirely lose their independent character, and cannot exist except in association with something else. These illuminations form the Accidental light—the attribute which has no independent existence. The relation, therefore, between the Accidental and the Abstract light is that of cause and effect. The effect, however, is not something quite distinct from its cause; it is a transformation, or a weaker form of the supposed cause itself. Anything other than the Abstract light (e.g. the nature of the illuminated body itself) cannot be the cause of the Accidental light; since the latter, being merely contingent and consequently capable of being negatived, can be taken away from bodies, without affecting their character. If the essence or nature of the illuminated body, had been the cause of the Accidental light, such a process of disillumination could not have been possible. We cannot conceive an inactive cause.[131:1]

It is now obvious that the Shaikh al-Ishrāq agrees with the Ash‘arite thinkers in holding that there is no such thing as the Prima Materia of Aristotle; though he recognises the existence of a necessary negation of Light—darkness, the object of illumination. He further agrees with them in teaching the relativity of all categories except Substance and Quality. But he corrects their theory of knowledge, in so far as he recognises an active element in human knowledge. Our relation with the objects of our knowledge is not merely a passive relation; the individual soul, being itself an illumination, illuminates the object in the act of knowledge. The Universe to him is one great process of active illumination; but, from a purely intellectual standpoint, this illumination is only a partial expression of the infinitude of the Primal Light, which may illuminate according to other laws not known to us. The categories of thought are infinite; our intellect works with a few only. The Shaikh, therefore, from the standpoint of discursive thought, is not far from modern Humanism.

Cosmology.

All that is "not-light" is, what the Ishrāqī thinkers call, "Absolute quantity", or "Absolute matter". It is only another aspect of the affirmation of light, and not an independent principle, as the followers of Aristotle erroneously hold. The experimental fact of the transformation of the primary elements into one another, points to this fundamental Absolute matter which, with its various degrees of grossness, constitutes the various spheres of material being. The absolute ground of all things, then, is divided into two kinds:—

(1). That which is beyond space—the obscure substance or atoms (essences of the Ash‘arite).

(2). That which is necessarily in space—forms of darkness, e.g. weight, smell, taste, etc.

The combination of these two particularises the Absolute matter. A material body is forms of darkness plus obscure substance, made visible or illuminated by the Abstract light. But what is the cause of the various forms of darkness? These, like the forms of light, owe their existence to the Abstract light, the different illuminations of which cause diversity in the spheres of being. The forms which make bodies differ from one another, do not exist in the nature of the Absolute matter. The Absolute quantity and the Absolute matter being identical, if these forms do exist in the essence of the Absolute matter, all bodies would be identical in regard to the forms of darkness. This, however, is contradicted by daily experience. The cause of the forms of darkness, therefore, is not the Absolute matter. And as the difference of forms cannot be assigned to any other cause, it follows that they are due to the various illuminations of the Abstract light. Forms of light and darkness both owe their existence to the Abstract Light. The third element of a material body—the obscure atom or essence—is nothing but a necessary aspect of the affirmation of light. The body as a whole, therefore, is completely dependent on the Primal Light. The whole Universe is really a continuous series of circles of existence, all depending on the original Light. Those nearer to the source receive more illumination than those more distant. All varieties of existence in each circle, and the circles themselves, are illuminated through an infinite number of medium-illuminations, which preserve some forms of existence by the help of "conscious light" (as in the case of man, animal and plant), and some without it (as in the case of minerals and primary elements). The immense panorama of diversity which we call the Universe, is, therefore, a vast shadow of the infinite variety in intensity of direct or indirect illuminations and rays of the Primary Light. Things are, so to speak, fed by their respective illuminations to which they constantly move, with a lover's passion, in order to drink more and more of the original fountain of Light. The world is an eternal drama of love. The different planes of being are as follow:—

"Image of table titled The Plane of Primal Light."

The Plane of Primal Light.1. The Plane of Intellects—the parent of the heavens,
2. The Plane of the Soul.
3. The Plane of Form.1. The Plane of ideal form.1. The Plane of the heavens.
2. The Plane of the elements:—(a). Simple elements.
(b). Compounds:—I. Mineral kingdom.
II. Vegetable kingdom.
III. Animal kingdom.
2. The Plane of material forms:—(a). The heavens
(b). The elements:—1. Simple elements
2. Compounds:—I. Mineral kingdom.
II. Vegetable kingdom.
III. Animal kingdom.