Saying is a specialized form of doing. When saying and doing are contrasted, what is asserted is a contrast between kinds of doing that have different implications. Proprieties of both saying and doing are matter for material inference.
Implicit consideration of a material-inferential ethical dimension is what distinguishes canonical Aristotelian saying from the mere emission of words. This dimension of ethics of material inference gives more specific content to epistemic conscientiousness.
Saying is also a social act that occurs in a larger social context. This gives it a second ethical dimension, starting from consideration of others and situational appropriateness. (See also Interpretive Charity; Honesty, Kindness; Intellectual Virtue, Love; Mutual Recognition.)