In human conversation, faith is necessary so that one man may believe the words of another, and this is the foundation of justice. Thomas Aquinas, (De Trinitate q. 3, a. 1).

https://en.wikipedia.org/wiki/Conversation_theory#References

Conversation Theory (Wikipedia) - a start

https://en.wikipedia.org/wiki/Relevance_theory

relevance Theory (Wikipedia). A start. Sperber and Wilson - linguistic theory of utterances. Have studied this in MEd.