Ephesians 5:3-4 KJVS
But fornication, and all uncleanness, or covetousness, let it not be once named among you, as becometh saints;
[4] Neither filthiness, nor foolish talking, nor jesting, which are not convenient: but rather giving of thanks.

Obscene stories and coarse jokes are so common that we begin to think they are fine and normal. Paul cautions, however, that improper language should have no place in the Christian’s conversation because it does not reflect God’s gracious presence in us. How can we praise God and remind others of his goodness when we are speaking crudely?