The title of our collection is owed to Hannah Arendt herself. Writing to Karl Jaspers on August 6, 1955, she spoke of how she had only just begun to really love the world and expressed her desire to testify to that love in the title of what came to be published as The Human Condition: "Out of gratitude, I want to call my book about political theories Arnor Mundi. "t In retrospect, it was fitting that amor mundi, love of the world, never became the title of only one of Arendt's studies, for it is the theme which permeates all of her thought. The purpose of this volume's a- ticles is to pay a critical tribute to this theme by exploring its meaning, the cultural and intellectual sources from which it derives, as well as its resources for conte- porary thought and action. We are privileged to include as part of the collection two previously unpu- lished lectures by Arendt as well as a rarely noticed essay which she wrote in 1964. Taken together, they engrave the central features of her vision of amor mundi. Arendt presented "Labor, Work, Action" on November 10, 1964, at a conference "Christianity and Economic Man:Moral Decisions in an Affluent Society," which 2 was held at the Divinity School of the University of Chicago.