 A distinction must be drawn between being good at something and having what is good for oneself. It is one thing to say, “he is good at acting” and another to say “acting is good for him”. Philosophers speak of the former as “perfectionist value” and the latter as “prudential value”. That is because when one tries to be good at something, one hopes to move closer to the ideal of perfection. Prudential value is the kind of good that it would be in someone’s interest to obtain—it is another term that belongs to the group we have been discussing: “well-being”, “welfare”, “benefit”, and so on.