Eighteenth window: Consider the following verse:

Have they not considered the truth contained in the inner dimension of the heavens and Earth? (7:185)

and the comparison explained in The Twenty-second Word:

A perfect, well-designed and artistic construction like a palace points to a perfect act—that is, a building points to an act of construction. A perfect, well-performed act points to a perfect actor, to a skillful master-builder. The title of a skillful master-builder points to a perfect attribute, to an artistic ability. A perfect attribute, a perfect competence in an art points to the existence of a perfect capacity. A prefect capacity or potentiality points to the existence of a noble spirit, an exalted being.

Likewise, the ever-renewed, refreshed, and replaced works filling Earth's face and the universe show acts of perfect degree. Those acts, occurring in an infinitely wise and well-ordered system, show an agent or an actor with perfect titles and names. Just as well-arranged and wise acts must have someone doing them, infinitely perfect titles point to that agent's infinitely perfect attributes. According to grammar, active participles and nouns denoting one who does something are derived from verbs. In Arabic, nouns originate in adjectives. Perfect attributes point to perfect personal potentialities, and perfect potentialities point to the one with a limit-less degree of perfection.

Thus, since each work of art and all creatures in the universe are perfect, and since each bears witness to an act, the act to a name, the name to an attribute, the attribute to a potentiality, and the potentiality to a being, then—as well as all of them testifying to a single Maker of Majesty's necessary Existence and Unity—as a whole they constitute a stairway of knowledge of God, which leads to Him in a form as strong as the chain of creatures, and a proof of truth in series that cannot be doubted.

So, O poor, heedless unbeliever, can you break this proof as strong as the chain of beings? Can you shut up this window that has innumerable openings to show the rays of truth? What veil of heedlessness can you draw across it?