Sharp, Sleek Sword: Warning for Every Believer

Sometime ago, in a hospital where I was practicing, a friend of mine gave us a riddle. He asked us to guess a powerful plague that is greater than HIV/AIDS and worse than cancer. His clue was This condition targets the heart of man. We all gave up after mentioning some heart diseases but could not decode his riddle. He cleared his throat and said, Deception is the canker that can destroy the body, soul, and spirit of a man. All terrible sicknesses in life can only destroy the body but not b...