What British academic philosopher has this quote attributed to him regarding the principle of charity "it constrains the interpreter to maximize the truth or rationality in the subject's sayings."?
Principle of charity In philosophy and rhetoric, the principle of charity requires interpreting a speaker's statements to be rational and, in the case of any argument, considering its best, strongest possible interpretation. In its narrowest sense, the goal of this methodological principle is to avoid attributing irrationality, logical fallacies or falsehoods to the others' statements, when a coherent, rational interpretation of the statements is available. According to Simon Blackburn "it constrains the interpreter to maximize the truth or rationality in the subject's sayings."
Moral supervenience The principle of moral supervenience states that moral predicates (e.g., permissible, obligatory, forbidden, etc.), and hence moral facts attributing these predicates to various particular actions or action-types, supervene, or are defined by and depend, upon non-moral facts. The moral facts are hence said to be "supervenient facts", and the non-moral facts the "supervenience base" of the former. The principle is sometimes qualified to say that moral facts supervene upon "natural" facts, i.e., observable, empirical facts within space-time, but a broader conception could allow the supervenience base to include any non-moral facts, including (if there are any) non-natural facts (e.g., divine commands, Platonic truths).