 In Principles Chapter IV Bentham sets out his conception of pleasure and utility in more detail, distinguishing between intrinsic and relational dimensions of pleasures. For our purposes, some dimensions matter more than others. Hedonism says that pleasure is the one and only intrinsic good and that pain is the one and only intrinsic evil. All other things have only extrinsic or instrumental value depending on whether and, if so, how much pleasure or pain they produce. Because the utilitarian asks us to maximize value, he has to be able to make sense of quantities or magnitudes of value associated with different options, where he assigns value to pleasure and disvalue to pain. Intensity, duration, and extent would appear to be the most relevant variables here. Each option is associated with various pleasures and pains both within a single life and across lives. For any given option we must find out how many pleasures and pains it produces, whether those occur in a single life or in different lives. For every distinct pleasure and pain, we must calculate its intensity and its duration. That would give us the total amount of (net) pleasure (or pain) associated with each option. Then we must do that option with greatest total. If there are two (or more) options with the greatest total, we are free to select any of these.