H. P. Grice reviews P. H. Nowell-Smith's 'contextual implication'

contextual implications: P. H. Nowell-Smith’s term for a distinctive use of ethical language. The proper use of ethical language in a given context authorizes certain inferences that the original ethical sentences cannot be said to assert or state, but which their use implies in that context. Any logical implication can be said to be a sub-class of contextual implication, but not vice versa. The denial of contextual implications is logically odd. The proper use of ethical language itself implies that the speaker believes his statement is true and conforms with the relevant recognized moral rules or his own moral principles. It also implies that what the speaker says may be assumed to be relevant to the interests of his audience and that he would make the same statement in similar situations. “I shall say that a statement P contextually implies a statement Q if anyone who knew the normal conventions of the language would be entitled to infer Q from P in the context in which they occur.” Nowell-Smith, Ethics