On the Old Saw: That May be Right in Theory But It Won't Work in Practice

In this famous essay, first published in 1793, Kant considers the alleged conflict between theory and practice in the conduct of human affairs in three widening contexts: those of the common person faced with a moral decision, of the politician and the citizen concerned with the extent and limits of political obligation, and, finally, of the citizen of the world whose actions have a bearing on war and peace among nations.

Unlike other animals, Kant reminds us, people must decide how they wil...