Judge rulers by results, not by virtue

Machiavelli's foundational break from earlier political writing is refusing to describe an ideal prince who behaves virtuously in the classical or Christian sense. Instead he studies how rulers actually keep or lose power, and concludes that a prince should be evaluated on outcomes — does the state remain stable, does the ruler retain power — rather than on adherence to moral virtue.

This is less a celebration of vice than a claim about political reality: rulers who insist on always acting virtuously, in a world full of rivals who won't return the favor, tend to lose power to those who don't share that constraint.

The famous formulation is that it's safer for a prince to be feared than loved, if he cannot be both — not because fear is admirable, but because love is a bond the ruled can break at will, while fear, well-managed, is more durable. Takeaway: political effectiveness and conventional virtue are not the same thing, and confusing them is a strategic error.