In short, we give more value to works that, from an entirely subjective perspective, generate a greater impact. This is the only parameter that really matters to us. It also seems to be the fairest, since it is independent of our predispositions. We cannot control what a work is capable of generating in us, and from this we realize that we can do nothing about its power. So, in the last instance, all that is needed in our judgment is sincerity to admit how much a work has been able to transform us.