For men do harm either out of fear or out of hatred. - Niccolò Machiavelli

Men injure either from fear or hatred.

So to hold it they were compelled to dismantle many cities in the country, for in truth there is no safe way to retain them otherwise than by ruining them. And he who becomes master of a city accustomed to freedom and does not destroy it, may expect to be destroyed by it, for in rebellion it has always the watchword of liberty and its ancient privileges as a rallying point, which neither time nor benefits will ever cause it to forget. And whatever you may do or provide against, they never forget that name or their privileges unless they are disunited or dispersed, but at every chance they immediately rally to them,

It's better to be impulsive than cautious; fortune is female and if you want to stay on top of her you have to slap and thrust. You'll see she's more likely to yield that way than to men who go about her coldly. And being a woman she likes her men young, because they're not so cagey, they're wilder and more daring when they master her.

... The armour of others is too wide, or too strait for us; it falls off us, or it weighs us down.