What is the relationship between understanding and knowing? This paper offers a defence of reductionism about understanding: the view that instances of understanding reduce to instances of knowing. I argue that knowing is both necessary and sufficient for understanding. I then outline some advantages of reductionism.
Moral understanding is a valuable epistemic and moral good. I argue that moral understanding is the ability to know right from wrong. I defend the account against challenges from nonreductionists, such as Alison Hills, who argue that moral understanding is distinct from moral knowledge. Moral understanding, she suggests, is constituted by a set of abilities: to give and follow moral explanations and to draw moral conclusions. I argue that Hills's account rests on too narrow a conception of moral understanding. Among other things, it cannot account for the importance of first-personal experience for achieving moral understanding.
To have moral worth an action not only needs to conform to the correct normative theory (whatever it is); it also needs to be motivated in the right way. I argue that morally worthy actions are motivated by the rightness of the action; they are motivated by an agent's concern for doing what's right and her knowledge that her action is morally right. Call this the Rightness Condition. On the Rightness Condition moral motivation involves both a conative and a cognitive element—in particular, it involves moral knowledge. I argue that the Rightness Condition is both necessary and sufficient for moral worth. I also argue that the Rightness Condition gives us an attractive account of actions performed under imperfect epistemic circumstances: by agents who rely on moral testimony or by those who, like Huckleberry Finn, have false moral convictions.
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