According to Machiavelli, moral principles must yield entirely to each unique circumstance’s requisites. Therefore, it is imperative that the Prince be willing to do anything necessary to maintain power; however, Machiavelli asserts strongly that above all, the Prince must not be hated.
The opening discourse of The Prince defines effective methods of governing in several types of principalities (eg new and hereditary). Machiavelli tells the reader, assumed to be a member of the Florentine aristocracy, of the best ways to acquire, maintain, and protect a state. The methods described therein preach war and ruthlessness.
Next, Machiavelli explains the qualities the ideal prince should possess, modeled after Cesare Borgia. These are still cited in modern texts on leadership. The traits of an effective political leader are presented as:
a willingness to imitate the behavior of great men, e.g. those of Ancient Rome in particular, the book being written in the Renaissance
the ability to illustrate how government is necessary to the well-being of the populace, e.g. perhaps by demonstrating the consequences of yielding to mob rule by temporarily relaxing one's grip
a dedication to the art of war — if only for the state's actual survival
an understanding that apparent cruelties and vice may be essential to maintaining stability and power
prudence with respect to disbursement of one's own wealth
making efforts to appear religious to sway the "vulgar." Machiavelli extols King Ferdinand of Spain for using the cloak of religion to invade Italy numerous times — he praises the tactic yet hates the invasion of Italy by other monarchs.
the wisdom to seek advice and counsel only when it is needed
It seems that Machiavelli disregards the connection between ethics and politics, which disturbed many of his contemporaries. However, Machiavelli actually departs from the classical conception of virtue in altering the connection between ethics and politics by altering the conception of virtue for a prince. The prince should endeavor to be seen as compassionate, trustworthy, sympathetic, honest, and religious. But in reality, the duties of the Prince very rarely allow him to actually be compassionate, etc.