The point here is to demonstrate the flaw in their discourse and in their analogy.
If, instead, they mean something that is distinct from the sun and subsists in something other than the sun—such as the ray that pervades the air and the earth, or the heat that accompanies it—then this very example proves the unsoundness of their claim from several angles:
First: These are separable, contingent properties, cut off from the sun and existing in something else, not in the sun itself. Their counterpart is what settles in the hearts of the prophets—knowledge, wisdom, and the revelation with which they warned humanity. On that premise, nothing of the lāhūt is actually inside the nāsūt; what is present are merely the effects of His wisdom and power.
Second: The heat and light that lodge in the air and in the walls are contingent attributes found in something other than the sun, whereas, in their doctrine, the Word and the Holy Spirit are two substances.
Third: What we are speaking of here is neither the sun itself nor one of the sun’s inherent qualities; it is only an effect produced in something other than the sun because of the sun. No one denies that such effects can reside in prophets and righteous people, yet the Messiah—peace be upon him—enjoys no exclusive prerogative in this regard. Whatever came to rest in the Messiah also came to rest in other messengers, and whatever did not reside in the others did not reside in him. Hence he has no distinctive feature that would make him a deity apart from the rest of the messengers, nor is there any fusion here between lāhūt and nāsūt—just as neither the sun nor its intrinsic attributes ever unite with the air and earth in which the ray and the heat are found.