The nation that wins my secret can sweep the world with invisible armies.

6 seconds sound clip from the The Invisible Man (1933) movie soundboard.

You can hear this line at 00:49:00.863 in the Blu-ray version of the movie.

Quote context

[...]

- I shall come back to you, Flora, very soon now.

- The secret of invisibility lies there in my books.

- I shall work in Kemp's laboratory till I find a way back. There is a way back, Flora. And then I shall come to you.

- I shall offer my secret to the world, with all its terrible power.

- The nations of the world will bid for it. Thousands, millions.

- The nation that wins my secret can sweep the world with invisible armies.

- Jack, I want you to let my father help you. You know how clever he is.

- He'll work with you day and night, until you find that second secret, the one that'll bring you back to us.

- Then we'll have those lovely, peaceful days again, out under the trees, after your work in the evening.

- Your father? Clever? You think he can help me? He's got the brain of a tapeworm, a maggot beside mine.

[...]