This volume asks how and why the concept of nature has changed its meaning in modernity and whether a rearticulation of premodern ideas about nature is possible. Building on the work of Voegelin, Strauss, Lonergan, Finnis, and others, the book compares and contrasts classical, medieval, and modern conceptions of nature. If natural law arguments struggle to gain traction in contemporary moral and political discourse, could it be because we moderns do not share the understanding of nature on which that language was developed? Building on the work of important thinkers of the last half-century, including Leo Strauss, Eric Voegelin, John Finnis, and Bernard Lonergan, the essays in Concepts of Nature compare and contrast classical, medieval, and modern conceptions of nature in order to better understand how and why the concept of nature no longer seems to provide a limit or standard for human action. These essays also evaluate whether a rearticulation of pre-modern ideas (or perhaps a reconciliation or reconstitution on modern terms) is desirable and/or possible. Edited by R. J. Snell and Steven F. McGuire, this book will be of interest to intellectual historians, political theorists, theologians, and philosophers.