For example, the mineral kingdom, no matter how much it may advance, can never comprehend the phenomena of the vegetable kingdom. Whatever development the vegetable may attain, it can have no message from nor come in touch with the kingdom of the animal. Although it is the possessor of existence in the world of creation, a tree, nevertheless, has no knowledge of the superior degree of the animal kingdom. Likewise, no matter how great the advancement of the animal, it can have no idea of the human plane, no knowledge of intellect and spirit. Difference in degree is an obstacle to this comprehension.
Degree is the barrier and limitation.
No matter how near perfection this rose may advance in its own sphere, it can never possess hearing and sight. This is impossible because the reality of Divinity is sanctified beyond the comprehension of the created being, man. Furthermore, that which man can grasp is finite to man, and man to it is as infinite. Whatever comes within the sphere of human comprehension must be limited and finite. As the essence of Divinity transcends the comprehension of man, therefore God brings forth certain Manifestations of the divine Reality upon Whom He bestows heavenly effulgences in order that They may be intermediaries between humanity and Himself.