•Why it earns a slot
One of the earliest and most forceful defenses of Brown delivered while he was still alive, from a writer usually associated with quiet civil disobedience rather than armed resistance, showing how far the abolitionist movement's most famous pacifist was willing to go.
Thoreau delivered this speech to his Concord neighbors while John Brown sat in a Virginia jail awaiting hanging for his armed raid on Harpers Ferry. Rather than defend Brown's tactics, Thoreau attacks the northern press and public for calling a man who tried to free enslaved people 'insane' while treating political conventions as more newsworthy than his fate.
This distillation is written from the freely available original, which is always the better read when you have the time: Project Gutenberg.