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Let your speech be always with grace, seasoned with salt, that ye may know how ye ought to answer every man. Colossians 4:6

The kind of tongue you have is determined by the kind of words rolling off it regularly. If your tongue is regularly used for dirty slangs, worldly music, abusive words and the likes, the devil marks it as his.

If that same tongue now turns around to cast out demons, they would only have a good laugh at its expense because a house divided against itself cannot stand (Mark 3:25 ). A tongue that belongs to the devil cannot cast him out.