“and at other times in the form of Dihya al-Kalbī.”
Whoever knows that the spirit may perceive what the body does not, and that some people perceive through their spirit and body what others do not, recognizes a wider range of avenues of perception. He does not regard sensory perception as confined to what most people perceive in this world through the body, for such perception apprehends only some existing things.
Thus, when it is said that everything that exists in its own right, or everything that exists, can be perceived, what is meant is perception broader than this particular kind, encompassing both this and that. Those who deny have no evidence establishing the existence of anything imperceptible to this kind of perception. The intelligible entities they affirm are merely universals established in the mind; in reality, these exist in minds, not as external entities.