For the heart (the understanding, the soul) of this people has grown dull (stupid, hardened, and calloused), and their ears are heavy and hard of hearing and they have shut tight their eyes, so that they may not perceive and have knowledge and become acquainted with their eyes and hear with their ears and understand with their souls and turn [to Me and be converted], that I may heal them. [Isa. 6:9, 10.]