Therefore take no thought, saying, What shall we eat? or, What shall we drink? or, Wherewithal shall we be clothed?
Note 44 at Mt 6:31: The way we take or receive anxious thoughts is by speaking them. Doubtful thoughts will come, but it is not sin until we entertain them (see note 17 at Mt 5:28). According to this verse, speaking forth these thoughts is one way of entertaining them. Therefore, don't speak forth these negative thoughts (compare with Pr 6:2, 13:3, 18:20-21; and Mt 12:36-37).