"Kahless has been dead for a thousand years; but the idea of Kahless is still alive. Have you ever fought an idea, Picard? It has no weapon to destroy, no body to kill." —Gowron,Star Trek: The Next Generation

What's the most resilient parasite? An idea. A single idea from the human mind can build cities. An idea can transform the world and rewrite all the rules. Armies and dictators have no power over them and while men can die, their ideas are immortal.

In fiction we get heroes dying but hope passed onto the audience by knowing that somehow his idea has lived on. Sometimes the hero is a martyr and his death is abeginning as people use it for inspiration; they are throwing off some kind ofmind-breaking torture attempt to show that the forces of fascism can't control them. A book of philosophy or some diary may have survived him or one of his inner circle may tell his tale and so the story ends on a happy note, but not too happy. Our story is sad but the tide of inevitable revolution will come.

Super-Trope ofCan't Stop the Signal. The characters who pass on the idea are likelyDoomed Moral Victors.

Anime and Manga

• InOne Piece, both Gold Rodger and Dr Hiriluk die embracing this ideal. Gold Rodger manages to start the Golden Age of Piracy.
  • In the face of a Marine Victory which could have snuffed out the Golden Age of Piracy,Whitebeard, with his last breath, proclaims Roger's treasure does exist, thus reigniting the idea once more. The Marines were not happy with this.
• Happens inCode Geass. Lelouch's ideals were to fight against injustice and tyranny caused largely by the Britannian Empire. Later, he causes changes in the empire itself, and in the end helps make the world a better place for almost everyone,at the cost of his life and reputation, as he had to be aManipulative Bastard in order to get many of the changes he wanted done.

Comic Books

• V for Vendetta: The anarchist title character, to Eric Finch, who's just shot him:

"Did you think to kill me? There's no flesh or blood within this cloak to kill. There's only an idea. Ideas are bulletproof."

• In300, Xerxes angrily declares that once he defeats the Spartans, he will completely destroy them and wipe out any trace of them from history. Leonidas coolly responds:

"The world will know that free men stood against a tyrant, that few stood against many and, before this battle is over, that even a god-king can bleed." (The ironic part is that, if Xerxes had followed through on his promised plans, the worldwouldn't know of the Spartans last stand)

Film

• InCasablanca, Victor Lazslo tries to assert this aboutLa Résistance against the Nazis. The film itself does a good job of illustrating the concept. UnfortunatelyThose Wacky Nazis are an also an idea, and one that Victor Lazlo is kinda, you know, trying to kill.
• Inception addresses this and emphasizes why it is so hard to plant one.
• V for Vendetta had an epic one near the end. After taking dozens of bullets and killing a dozen men before they could finish reloading (as per hisBadass Boast), V approaches TheDragon-in-Chief, who asks, in disbelief, "Why Won't You Die?!" His response? "Beneath this mask is more than flesh; beneath this mask there is anidea, Mister Creedy -- andideas. Are.Bulletproof."
  • Of course, the metal plate under his shirt helped.
  • Take it literally. The idea is to wear bullet-resistant plate when going to a gunfight.
• Bruce Wayne uses this sort of reasoning when devising his future role inBatman Begins, as advised by Henri Ducard; a man acting just by himself as a man can be killed, bribed or discouraged, but by becoming a 'symbol' the man becomes "more than just a man"; even if he dies, the symbol lives on to inspire others.Guess what symbol Bruce eventually settles on...And it's heavily implied that Ra's Al Ghul has operated by the same principle.
• Played with inDogma where Rufus comments that "ideas" are malleable and can change and possibly even die out. "Beliefs," which are strengthened ideas, are much harder to even change, let alone kill. It also places a spin on it in that the fact that a belief is hard to 'kill' is not necessarily a good thing if the belief is not a good one, or if the belief has become an overly rigid dogma

Literature

• Subverted inNineteen Eighty-Four, in an inversion of the inspirational "the hero lives on" type of endings:Winston is allowed to live long enough to be forced to admit that he really does love Big Brother before being killed, so the audience knows that in no way were the ideas of The Party overcome.
  • More disturbingly, the entire concept ofNewspeak is meant to defy this trope, bysystematically eradicating even the words that could express ideas such as liberty, rebellion, or individuality, which run counter to the ideological orthodoxy of the Party.
• Played for Laughs inDiscworld novels on several occasions, frequently with people using rumors that once they get started can not be stopped.
  • InInteresting Times, for instance, Rincewind goes around telling soldiers thatin no way are there any invisible vampire ghosts about to attack them in the following battle and there areabsolutely not 2,300,009 of them.
  • Of course Discworld takes it literally many times.Witches Abroad introduces the idea that on the Discworld, stories have not only memetic influence, butare a law of nature. InSoul Music andMoving Pictures, the immortal idea (rock music and movies, respectively) is theBig Bad.
  • InThief of Time the Glass Clock, which destroyed all of history in the past, was removed from any books by the History Monks, but something that strong still seeped through and found its way into children's stories.
• Belisarius Series: Used first seriously and then humorously. Belisarius starts a rumor about sexual prowess and general horniness of the Kushans in order to get Kungas and his men pulled away from their guard duty of a captured princess. Their incompetent replacements are easily dispatched and allow her to be rescued. Later, once the confused Kushans find out about the origin of the rumor, they then take delight in spreading it themselves.
• The Dresden Files novellaBackup goes into a bit of detail about The Oblivion War, a war waged, essentially, against ideas. Specifically, the memory of some unpleasant old gods who can't do anything if humans remain blissfully unaware of their existence. We don't get alot of information, but since the antagonist is a cultist of said gods, and Thomas (the novella protagonist) mentioned the war has been ongoing for thousands of years, it fits.
• In theEighth Doctor Adventures, a group of Time Lords (the Celestis) take this concept literally, andconvert themselves into ideas for this very reason. Unfortunately for them, a later book reveals that theWhoniverse also contains creatures whichcan kill—and eat—ideas.
  • The heavily associated spin-offFaction Paradox basicallyis this trope.
• This is the crux ofKelsier'sThanatos Gambit inMistborn. He purports himself as a figure of legend and a symbol of evolution, so that when he is killed, a vengeful religion rises up immediately to complete his work in his name.
• InFatherland (rephrased): "Cut a clearing in the forest of your mind, the trees are just waiting to reoccupy it."

Live-Action TV

• Star Trek: The Next Generation, "Rightful Heir": Chancellor Gowron talks about the symbolic effect of the return of the KlingonGod-Emperor.

"Kahless has been dead for a thousand years; but the idea of Kahless is still alive. Have you ever fought an idea, Picard? It has no weapon to destroy, no body to kill."

• Star Trek: Deep Space Nine: "Far Beyond The Stars". Benjamin Sisko, dreaming that he's a science fiction writer in the '50s, reacts rather badly to having his story pulped because it has a black Captain.

"You can deny me all you want but you can't deny Ben Sisko – He exists! That future, that space station, all those people – they exist in here! In my mind. I created it. And every one of you knew it, you read it. It's here. Do you hear what I'm telling you? You can pulp a story but you cannot destroy an idea, don't you understand, that's ancient knowledge, you cannot destroy an idea. That future – I created it, and it's real! Don't you understand? It is real. I created it. And it's real! It's real!"

• Doctor Who: The Doctor was able to destroy a prime minister with this trope. He only needed to say six words to an aide."Don't you think she looks tired?" He doesn't die(quite the opposite, really), and the PM isn't necessarily evil, but he doesuse the principle of an idea being unkillable.
• At the climax ofBabylon 5‍'‍s Vorlon-Shadow War, Delenn and Sheridan point out that, even if they and their coalition are killed, their assertion that the younger races no longerneed the First Ones is true. All the First Ones can do is subjugate them, not "teach" them as the two sides insist they want to.

Video Games

• InAssassin's Creed II, one of the Codex pages reveals that Altaïr mused on this subject more than once, noting that theTemplars waged war by seeking to win over the hearts and minds of people with ideas, rather than more conventional weapons. This made it rather difficult for theAssassins to fight back... But it also makes it rather difficult for the Templars to exterminate them.

Altaïr Ibn-La'Ahad...how does one wage war against a concept? It is the perfect weapon. It lacks a physical form yet can alter the world around us in numerous, often violent ways. You cannot kill a creed. Even if you kill all of its adherents, destroy all of its writings – these are a reprieve at best. Some one, some day, will rediscover it. Reinvent it. I believe that even we, the Assassins, have simply re-discovered an Order that predates the Old Man himself...

• Invoked inDeus Ex when the terrorist leader says 'You can't fight ideas with bullets'.
  • "A single artist, a single general, a single hero or a single villain may all die, but it is impossible to kill a people, a nation, an idea -- except when that idea has grown weak and is overpowered by one that is stronger."—The Doctrine of the Mighty
• InMadWorld, XIII says that he wants to see an idea die. A culture. A religion. Any idea.He got his wish.TheBlood SportDeathwatch is dead.
• The Illusive Man tries to pull this inMass Effect 3...but it makes absolutely no sense whatsoever and Cerberus is pretty much forgotten about once you blow up his base.
• Knights of the Old Republic: This is one of Kreia's favorite tropes. She points out that killing men is easier than killing belief and that Revan, in the process of fighting the Mandalorians,adopted Mandalorian tactics and their intolerance for the "weak." She also points out that every time the Jedi and Sith fight each other to near-extinction, theideals of either side still remain as strong as ever, waiting for their chance to strike back in revenge and dooming the galaxy to endless warfare.
• Tactics Ogre:

Sisteena: If you want to kill me, go ahead. I may die but my ideals will live on!

Web Comics

• Remus Shepard had a go at this inIndefensible Positions, then deconstructed it inGenocide Man. The protagonist of the latter argues that an idea can be killed, and that some ideasshould be killed—even if the only way to do so is to slaughter every single person who holds the idea.

Real Life

• TheTrope Namer is American civil rights activist Medgar Evers: "You can kill a man, but you can't kill an idea." He was later shot dead by a Klansman, but the civil rights movement endured.
• Martyrs, likeJesus, are one of the reasons why Christianity flourished, since while Jesus himself died, the Proto-Christian cultists who becameThe Remnant and the later Early Christians kept the ideology alive using the story of his life and his teachings untilEmperor Constantine I attributed his victory in a battle to Christianity, which was the big turning point, albeit at the expense of pre-existing religions.
• Che Guevara's last words,according to at least one biography:

I know you have come to kill. Kill me if you wish, coward, but know that you can only kill a man.

• There were several sects of early Christians that are only known about by official church writings condemning them. In some cases we only have the names and there must have been others where even that hasn't survived. Of course since we don't know what their ideas were it is impossible to say whether those ideas were killed, absorbed by the Catholic Church or recycled by better known groups.
• "A man may die, nations may rise and fall, but an idea lives on. Ideas have endurance without death." --John F. Kennedy
• Josef Stalin had a go:

Ideas are more powerful than guns. We would not let our enemies have guns, why should we let them have ideas?

• Government propaganda targeted at an enemy intentionally invokes this trope, especially during wartime.
• Opponents of theWar On Terror and War On Drugs invoke this trope as one of their points.We shall not go any further.
• Generally, outside attempts to forcibly repress or destroy an idea are doomed to fail, but ideas can destroythemselves if they inspire widespread revulsion and their practitioners are doing horrible things.
• A legal punishment in ancient Rome wasdamnatio memoriae, which wasan attempt to erase a political figure completely from history after his or her death. Their faces would be removed from portraits, statues damaged, and anything mentioning their name would be destroyed or erased. This is extremely difficult to pull off completely - for instance, we have some surviving busts of Publius Septimius Geta, denarii featuring his image, and a wealth of information about his personality, tastes, family politics and eventual assassination - and obviously it's impossible to know if a complete damnatio memoriae ever occurred.
• A saying from the NorsePoetic Edda, attributed toOdin:

Cattle die, kinsmen die, we ourselves also die; but the fair fame never dies of him who has earned it.

• A similar saying was utilized in the Occupy protests, by the slogan "You cannot evict an idea".

• Trope
• You Cannot Kill an Idea
• Civil Unrest Tropes
• Politics Tropes