Niccolò Machiavelli
The Prince

Machiavelli's best-known book Il Principe contains several maxims concerning politics. Instead of the more traditional target audience of a hereditary prince, it concentrates on the possibility of a "new prince". To retain power, the hereditary prince must carefully balance the interests of a variety of institutions to which the people are accustomed. By contrast, a new prince has the more difficult task in ruling: He must first stabilise his newfound power in order to build an enduring political structure. Machiavelli suggests that the social benefits of stability and security can be achieved in the face of moral corruption. Machiavelli believed that public and private morality had to be understood as two different things in order to rule well. As a result, a ruler must be concerned not only with reputation, but also must be positively willing to act unscrupulously at the right times. Machiavelli believed that, for a ruler, it was better to be widely feared than to be greatly loved; a loved ruler retains authority by obligation, while a feared leader rules by fear of punishment. As a political theorist, Machiavelli emphasized the "necessity" for the methodical exercise of brute force or deceit, including extermination of entire noble families, to head off any chance of a challenge to the prince's authority.

Scholars often note that Machiavelli glorifies instrumentality in state building, an approach embodied by the saying, often attributed to interpretations of The Prince, " The ends justify the means ". Fraud and deceit are held by Machiavelli as necessary for a prince to use. Violence may be necessary for the successful stabilization of power and introduction of new political institutions. Force may be used to eliminate political rivals, destroy resistant populations, and purge the community of other men strong enough of a character to rule, who will inevitably attempt to replace the ruler. Machiavelli has become infamous for such political advice, ensuring that he would be remembered in history through the adjective, "Machiavellian".

Due to the treatise's controversial analysis on politics, the Catholic Church banned The Prince, putting it on the Index Librorum Prohibitorum. Humanists also viewed the book negatively, including Erasmus of Rotterdam. As a treatise, its primary intellectual contribution to the history of political thought is the fundamental break between political realism and political idealism, due to it being a manual on acquiring and keeping political power. In contrast with Plato and Aristotle, Machiavelli insisted that an imaginary ideal society is not a model by which a prince should orient himself.

Concerning the differences and similarities in Machiavelli's advice to ruthless and tyrannical princes in The Prince and his more republican exhortations in Discourses on Livy, a few commentators assert that The Prince, although written as advice for a monarchical prince, contains arguments for the superiority of republican regimes, similar to those found in the Discourses. In the 18th century, the work was even called a satire, for example by Jean-Jacques Rousseau.

Scholars such as Leo Strauss and Harvey Mansfield have stated that sections of The Prince and his other works have deliberately esoteric statements throughout them. However, Mansfield states that this is the result of Machiavelli's seeing grave and serious things as humorous because they are "manipulable by men", and sees them as grave because they "answer human necessities".

Another interpretation is that of Antonio Gramsci, who argued that Machiavelli's audience for this work was not even the ruling class, but the common people, because rulers already knew these methods through their education.
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