Constantly walking bare feet will harden the skin under the feet, making it calloused and insensitive. Likewise, the eyes and ears become insensitive if constantly exposed to bright light and loud noise.
Don't expose yourself to the sinful pleasures of this world and become insensitive to the Gospel. Listen to what Jesus said: "For this people’s heart has become calloused; they hardly hear with their ears, and they have closed their eyes. Otherwise they might see with their eyes, hear with their ears, understand with their hearts and turn, and I would heal them.’ (Mat.13:15)