John Henry Jowett in The Grace Awakening, C. Swindoll, Word, 1990, pp. 140-41
Sin is a blasting presence, and every fine power shrinks and withers in the destructive heat. Every spiritual delicacy succumbs to its malignant touch...Sin impairs the sight, and works toward blindness. Sin benumbs the hearing and tends to make men deaf. Sin perverts the taste, causing men to confound the sweet with the bitter, and the bitter with the sweet. Sin hardens the touch, and eventually renders a man "past feeling." All these are Scriptural analogies, and their common significance appears to be this&md;sin blocks and chokes the fine senses of the spirit; by sin we are desensitized, rendered imperceptive, and the range of our correspondence is diminished. Sin creates callosity. It hoofs the spirit, and so reduces the area of our exposure to pain.