 Ross says a number of highly interesting things about knowledge, including about the value of knowledge (RG 148). One thing he says, for example, is knowledge is always more valuable than right opinion. He seems to think knowledge better in part because right opinion always rests on ‘psychological causes (largely irrational)’, e.g., wishes, hopes, and fears (RG 146). Against Ross, one might suggest not all right opinion – e.g., opinion carefully formed on the basis of the best evidence – necessarily rests on such causes (Phillips 2019, 144). Suppose having used the best, most sophisticated polling data I believe with a credence level of 84% that a certain politician will win a by-election and she does. My being able to have only probable opinion in this case need not result from some intellectual vice or shortcoming.