In one sense, we have already considered the attainment of happiness, for in Question 4 we investigated the requirements that must be fulfilled in order to have it. This turned out to be a more complex question than might have been expected, because there is more than one sense in which a thing can be required for happiness. For example, it may be required in the sense that happiness cannot exist without it, or merely in the sense that it is one of its concomitants.