Why identical strategies made one ruler unstoppable and ruined the one after him

Niccolò Machiavelli was aware that his entire book might seem pointless. If human affairs are governed by fortune and by God, and men can't alter them no matter how prudent they are, why bother giving advice at all? Machiavelli takes that possibility seriously before pushing back against it. His answer is a compromise: fortune, he says, is mistress of about half of what happens to us, and leaves the rest, or a little less, in our own hands.

He explains this with an image. Fortune is like one of those wild rivers that, when they rise, sweep away trees and houses and nobody can resist them. But it does not follow that in calm weather people are helpless. They can build dikes and channels ahead of time, so that when the flood comes, it has somewhere to go besides straight through the town. Italy, in Machiavelli's own time, was a country without those defenses, which is exactly why every invasion had swept through it so completely; Germany, France, and Spain, better prepared, had not suffered the same way.

The harder part of his argument is about matching temperament to moment. Machiavelli observed that two people acting with equal caution can meet opposite fates, and two people acting in completely opposite ways, one bold, one careful, can both succeed, purely because the character of the times happened to suit their approach. Pope Julius the second, he notes, acted with reckless speed in nearly everything he attempted, and the times kept rewarding him for it, right up until his death spared him from ever meeting a moment that called for patience instead.

That is the trap Machiavelli identifies: nobody can permanently rewrite their own nature. A cautious person stays cautious even after the moment for caution has passed, and an impetuous person stays impetuous even when it starts to ruin him. Since the times keep shifting, whatever made you succeed yesterday can be the exact thing that destroys you tomorrow. Machiavelli's own conclusion, offered as his personal judgment rather than settled fact, is that boldness beats caution more often than not, because fortune, in his own phrase, favors those audacious enough to master her.

Start using calm periods, not crises, to prepare for the disruptions you can already half see coming, building whatever version of a dike fits your situation, savings, contingency plans, spare capacity. Get honest about which temperament you default to, cautious or bold, because you won't be able to swap it out on demand. Watch the times around you rather than assuming your past approach will keep working, and when the ground shifts, treat that as your cue to question your instincts rather than double down on them. And where a decision could go either way, remember that boldness was Machiavelli's own bet, so let that tip the balance when hesitation itself is the bigger risk.