The false convert has never “crucified the flesh with its passions and desires” (Gal. 5:24). He, like the pig, must go back to wallowing in the mire. Pigs need to wallow in mire because they crave the slime to cool their flesh. So it is with the false convert. He never repented, so his flesh was not crucified with Christ. It is instead burning with unlawful desire. The heat of lust is too much for his sinful heart. He must go back to the filth.