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For the sensual faculties, where passions are seated, are subject to motions, some over-vehement, sudden, and quick, and others again too remiss, and more slow and heavy than is convenient. So that, though every thing we do can be good but in one manner, yet it may be evil in several; as there is but one single way of hitting the mark, but to miss it a great many, either by shooting over, or under, or on one side. The business therefore of practical reason, governing our actions according to the order of Nature, is to correct the excesses as well as the defects of the passions, by reducing them to a true mediocrity. For as, when through infirmity of the mind, effeminacy, fear, or laziness, the vehemence and keenness of the appetites are so abated that they are ready to sink and fall short of the good at which they are aimed and directed, there is then this practical reason at hand, exciting and rousing and pushing them onward; so, on the other hand, when it lashes out too far and is hurried beyond all measure, there also is the same reason ready to bring it again within compass and put a stop to its career. And thus, prescribing bounds and giving law to the motions of the passions, it produces in the irrational part of the soul these moral virtues (of which we now treat), which are nothing else but the mean between excess and defect. For it cannot be said that all virtue consists in mediocrity; since wisdom or prudence (one of the intellectual virtues), standing in no need of the irrational faculties,—as being seated in that part of the soul which is pure and unmixed and free from all passions,—is of itself absolutely perfect, the utmost extremity and power of reason, whereby we attain to that perfection of knowledge which is itself most divine and renders us most happy. Whereas moral virtue, which because of the body is so necessary to us, and, to put things in practice, stands in need of the instrumental ministry of the passions (as being so far from promoting the destruction and abolition of irrational powers, as to be altogether employed in the due regulation thereof), is, with respect to its power or quality, the very top and extremity of perfection; but, in respect of the proportion and quantity which it determines, it is mediocrity, in that it takes away all excess on the one hand, and cures all defects on the other.
