Writers in our field make all sorts of pithy statements about trust (eg., "it's not whether I trust my students, it's whether my students trust me" but a proper understanding of the role of trust in learning requires a deeper analysis of what is meant by trust. This article offers the beginnings of such an inquiry. "Researchers agree that social trust causes many positive social outcomes. But they differ on its definition and causes... Social trust (for example) requires a belief that people ordinarily have adequate moral motivation to follow moral rules. They ignore this motivation only as a moral fault."