In this comprehensive collection of essays representing a lifetime of scholarship, distinguished political scientist Richard Stevens examines the fundamental principles of the American Constitutional order. Stevens discusses the Constitution's roots in Renaissance and Enlightenment political philosophy, and evaluates several major twentieth-century constitutional commentators. With a focus on the core of constitutional principle, Stevens critiques such views as that the Constitution founds a mixed regime, or is rooted in Christianity, or is a 'living constitution,' or is to be interpreted in the light of a 'higher law background.' Broad in scope and penetrating in analysis, this book is essential reading for students and scholars of constitutional law, American political thought, and American history.