Thinking can be both active and passive. We can choose where to direct our attention and use reason to solve problems or consider why things happen. Still, we cannot completely control our stream of thought; feelings and ideas bubble up from influences outside our control. One kind of passive thinking is letting others think for us. Such passive thinking, Kant thought, was not good for anybody.
Kant's account of evil makes three key claims with major consequences for moral agency and responsibility. First, the distinction between good and evil lies in the will (R 6:59). Unlike prior theories that locate evil in natural inclinations or external circumstances, Kant situates evil in the will's choice of maxims. This reveals that earlier theories misidentify both evil's source and its effect on agency, leading to misguided remedies (R 6:59).