In her TED talk, "I grew up in the Westboro Baptist Church. Here's why I left," Megan Phelps-Roper offers four conditions that, when met, enable us to have constructive conversations with "the other." Her first three conditions are examples of the heart dimension of communication, and her last is an example of the mind dimension.
The 3:1 ratio is important. Too often we short-change the heart dimension, creating a relationship that lacks the connection, trust and resilience necessary for engaging in a difficult conversation.
The following fleshes out the heart and mind dimensions in a little more detail.