Progress vs. Human Nature
Hank can build a telegraph line but can't change how people think. The novel argues that technology outpaces wisdom—and that forcing modern systems onto people who haven't changed their beliefs just creates more efficient ways to fail.
Power Built on Illusion
Hank's authority rests entirely on a bluff—the eclipse trick. Merlin's authority rests on theater. The Church's authority rests on fear. Twain shows that power in any era is largely performance, and the most dangerous performers are the ones who believe their own act.
Satire of Romanticism
Twain wrote this book to puncture the romantic glorification of the Middle Ages popular in his time. Camelot isn't noble—it's brutal, dirty, and unjust. Knights are thugs with armor. The chivalric code ignores the suffering of everyone below the nobility.
The Limits of Enlightenment
Hank represents Enlightenment confidence: reason, science, and progress will fix everything. The novel systematically destroys that confidence. The people Hank wants to help don't want what he's selling, and his certainty that he knows best is itself a form of tyranny.
Violence as the Endpoint of Power
Every major power struggle in the novel ends in violence. Hank's final act is a mass slaughter. Twain suggests that whether the weapons are swords or Gatling guns, power ultimately rests on the capacity for destruction—and modern power is just more efficient at it.