I just remembered this excerpt from 1984 by George Orwell:
He took a twenty-five cent piece out of his pocket. There, too, in tiny clear lettering, the same slogans were inscribed, and on the other face of the coin the head of Big Brother. Even from the coin the eyes pursued you. On coins, on stamps, on the covers of books, on banners, on posters, and on the wrappings of a cigarette packet—everywhere. Always the eyes watching you and the voice enveloping you. Asleep or awake, working or eating, indoors or out of doors, in the bath or in bed—no escape. Nothing was your own except the few cubic centimetres inside your skull.
When I read this for the first time, it made me think of the power of the Bitcoin secret seed I keep in my mind. No matter how tyrannical they become, they will never reach those "few cubic centimetres inside your skull". That seed is not only how I can access my wallet anytime, anywhere, but the very germ of my own freedom. And that's something no one will ever take away from me.