 The version of Kant’s view that Lange considers is the one presented in the Critique of Practical Reason. Lange’s focus on this version, like his interpretation of Kant’s views on theoretical reason, set him apart from many later Kant scholars. The Critique of Practical Reason shares with Kant’s other writings the claim that there is a fundamental law of practical reason which is also the moral law. It focusses though on one particular formulation of this law: “So act that the maxim of your will could always hold at the same time as a principle in a giving of universal law”. What is distinctive about the Critique of Practical Reason is that Kant then proceeds to give a distinctive account of how we come to know this law or how this law is justified. He writes: