The research evidence is unmistakable: deep learning is most powerful, and often necessary, in social discourse. Learning in the presence of others allows us to understand the world as others see it, and to try on perspectives that we would not have known about otherwise. Learning with others is perilous, often leading to the hardening of beliefs and attitudes, and so the chapter also includes a discussion of how social discourse can be most productive, focusing on four facilitators: empathy, social capital, participatory forms of engagement and learning, and minimal power differentials and shared responsibility.