Book 1.10

For this cause reason will never call to its aid blind and fierce impulses, over whom she herself possesses no authority, and which she never can restrain save by setting against them similar and equally powerful passions, as for example, fear against anger, anger against sloth, greed against timidity. May virtue never come to such a pass, that reason should fly for aid to vices! The mind can find no safe repose there, it must needs be shaken and tempest-tossed if it be safe only because of its own defects, if it cannot be brave without anger, diligent without greed, quiet without fear: such is the despotism under which a man must live if he becomes the slave of a passion. Are you not ashamed to put virtues under the patronage of vices? Then, too, reason ceases to have any power if she can do nothing without passion, and begins to be equal and like unto passion; for what difference is there between them if passion without reason be as rash as reason without passion is helpless? They are both on the same level, if one cannot exist without the other. Yet who could endure that passion should be made equal to reason? "Then," says our adversary, "passion is useful, provided it be moderate." Nay, only if it be useful by nature: but if it be disobedient to authority and reason, all that we gain by its moderation is that the less there is of it, the less harm it does: wherefore a moderate passion is nothing but a moderate evil.