The model of Church as Mystical Communion draws on two major Biblical images, the first of the "Mystical Body of Christ" (as developed in Paul's Epistles) and the second of the "People of God." This image goes beyond the Aristotelian-Scholastic model of "Communitas Perfecta" held in previous centuries. This ecclesiological model draws upon sociology and articulations of two types of social relationships: a formally organized or structured society (Gesellschaft) and an informal or interpersonal community (Gemeinschaft).