"Die Religion innerhalb der Grenzen der bloßen Vernunft" by Immanuel Kant is a philosophical work published between 1793 and 1794. Kant develops a religion based purely on reason, examining whether humans are naturally good or evil. He explores the "radical evil" within every person and presents Christ as a symbol of moral perfection. The work outlines how humanity might progress toward moral completeness through reason rather than revelation, introducing the concept of an "ethical commonwealth" and distinguishing between visible and invisible churches.