The story of the preacher and the man: “Son you need to join the Lord’s army.” “I am in the Lord’s army already pastor” said the man. “Why do I only see you in church twice a year?” “Oh, I belong to the secret service.”
The majority of us are familiar with the term undercover cop or agent. One whose main purpose blend in while hiding his true identity. Undercover: done or working in a secret way in order to catch criminals or collect information.