The chemist and physicist pursuing their researches into the nature of matter have passed from masses to molecules, from molecules to atoms, from atoms to electrons and ether, but at every step the difficulties of the research increase till the most profound intellect can penetrate no farther, and can but bow in silent awe before the unknown Infinite which remains ever shrouded in inscrutable mystery.
Flower in the crannied wall, I pluck you out of the crannies.
I hold you here, root and all, in my hand, Little flower--but if I could understand What you are, root and all, and all in all, I should know what God and man is .-- TENNYSON.
If the flower in the crannied wall, if even a single atom of matter, present mysteries which the most profound intellect cannot solve, how is it possible for man to comprehend the universe?
How dare he pretend to define or describe the Infinite cause of all things?
All theological speculations about the nature of God's essence are thus swept aside as foolish and futile.
Knowledge of God But if the essence is unknowable, the manifestations of its bounty are everywhere apparent.

If the first cause cannot be conceived, its effects appeal to our every faculty.

Just as knowledge of a painter's pictures gives to the connoisseur a true knowledge of the artist, so knowledge of the universe in any of its aspects--knowledge of nature or of human nature, of things visible or of things invisible--is knowledge of God's handiwork, and gives to the seeker for Divine truth a real knowledge of His Glory.
"The Heavens declare the glory of God; and the firmament sheweth his handywork.

Day unto day uttereth speech, and night unto night sheweth knowledge .-- Ps.

xix, 1-2.
The Divine Manifestations All things manifest the bounty of God with greater or less clearness, as all material objects exposed to the sun reflect its light in greater or less degree.