[100] For it follows of necessity that those persons who, being by nature unfitted for the comprehension of arts, if by making violent efforts they do something in them, [47] [48] not only fail of attaining their end, but also incur disgrace; and those who voluntarily, but still without any deliberate consent of their mind, do something that they ought to do, putting a sort of constraint on their own voluntary principle, do not succeed, but are wounded and harassed by their own consciences.