Seeing the Gospel

Romans 1:16; 1 John 1:3; 2 Corinthians 3:2
“Have you ever heard the Gospel?” asked a missionary of a Chinese man, whom he had not seen in his mission before.
“No,” he replied, “but I have seen it. I know a man who used to be the terror of his neighborhood. He was a bad opium smoker and dangerous as a wild beast; but he became wholly changed. He is now gentle and good and has left off opium.”