3 quotes from Demon Slayer, each with commentary on what it means and why it stuck.
“People don't simply recover instantly. No matter how strong someone is, they can feel pain and sadness. But hiding from it solves nothing. You must rouse your aching heart and stand back up. I'm sure Rengoku was that kind of person.”
“Don't ever give up. Even if it's painful, even if it's agonizing, don't try to take the easy way out.”
The most generic sentence in his catalog, and the one that circulates. It would fit any character in any shonen series going, which is the definition of a line that tells you nothing about this one. Zenitsu's real material is specific and fairly unpleasant: a boy used for money by the girls he dated, taken on as a student by the man who paid off his debt, able to use only the first form of Thunder Breathing, who spends his screen time announcing at volume that he is worthless and about to die. The scene attached to this is genuinely his bravest, too. He is poisoned on Mount Natagumo, slowing the venom with his own breathing, awake. And the sentence he gets for it could have come off a gym wall. The interesting thing about Zenitsu is that he has to say it to himself: the boy who announces his own death at volume is the one who talks himself out of it.
“Clearly Gramps did smack me around a bit too much. But he never abandoned me.”
The joke and the thesis in one sentence, and the second half is carrying it. Jigoro Kuwajima took in a boy who could not learn any form of Thunder Breathing except the first, and trained him on that one rather than sending him away. Everything Zenitsu says about himself is the vocabulary of somebody who expects to be dropped: he announces his own uselessness first, loudly, before anyone else gets the chance, which is a defensive measure rather than a personality. Against that, never abandoned me is the largest compliment available to him, and it is being paid to a man who hit him. The bar sits exactly where a childhood of being discarded would set it, and Demon Slayer is honest enough not to raise it on his behalf.
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He is borrowing a dead man's voice to sound braver than he is, and the last clause concedes as much before anybody can raise it. He does not claim to be that kind of person. He assigns it to Rengoku and leaves himself out of the sentence entirely. That is the honest version of what he is doing, and it is why the speech works where a resolution would not. Zenitsu fights effectively when unconscious. So this time he is walking alone, awake, working out from the outside what courage would look like, using the only sample he has.