This thinker compares a physician curing a patient to a murderer poisoning a victim when contrasting the rule of skill with the happiness-based counsel of prudence. Helga Varden added a Nazi officer to an argument criticizing this thinker first made by Benjamin (15[3])Constant. (15[1])The employment of assassins would be (15[1])banned and standing armies (15[1])abolished in this thinker’s (-5[1])proposal (15[1])for a (*) Perpetual (10[2])Peace (10[1])between republican (10[1])states. This thinker claimed that lying to a (10[1])man knocking on your (10[1])door was not (10[3])moral even if you (10[1])knew he was a murderer looking for a potential victim. This thinker’s ethical system centers on acting consistently with universal (10[2])rules through the (10[2])categorical imperative. For 10 points, name this German philosopher who wrote Critique of Pure Reason. ■END■