A pig returns to its mud because it is the nature of a pig to love mud. Don’t be surprised when you see some people start attending church, and seem to clean up their lives, only to go running back into the same old filthy, sinful lifestyle. Their nature was never changed. A counterfeit Christian is like that old pig. The lesson of the prodigal pig is this: You can clean a person up on the outside, but unless their inner nature is changed, they will always return to sin.