Friedrich Nietzsche - Open Enemies lyrics

Bravery in presence of an enemy is a thing by itself: a person may possess it and still be a coward and an irresolute numbskull. That was Napoleon's opinion concerning the "bravest man" he knew, Murat: from which it follows that avowed enemies are indispensable to some men, if they are to attain to their virtue, to their manliness, to their cheerfulness.