 He prefers to retain his original tripartite structure, but to soften any apparent harshness by further explanation. Many of our obligations, such as that of being benevolent, are framed only in general and vague terms. How and when we fulfill them is, to some extent, up to us. Since it is unclear exactly how much is required of us by way of kind deeds, a truly virtuous person will err on the side of generosity. The praise we bestow on them is not, as the proponent of supererogation supposes, because they exceeded the demands of duty, but because they showed such scrupulous care to ensure that they did not fall short of what was required of them. This solution has the advantage of explaining why the heroic or saintly frequently claim that they were, after all, only doing their duty, rather than claiming that they were exceeding it.