The Two Sources are the two books provided.
Schultze and Badzinski provided Bible-based guidance for making sure the content of our communication is truthful, honest, transparent, authentic, self-disclosing, relationship-enhancing, faithful, and encouraging (Chapters 5-6). Petersen offered principles for making sure our talking processes are effective, constructive, and balanced (Chapters 10-13). Examine yourself and the messages you send in the role of talker in light of this material.
