The world's gonna know how great I am. People think I'm just talking. They call me a big mouth. After this, you're gonna see... I am the greatest! I am the greatest!

10 seconds sound clip from the The Greatest (1977) movie soundboard.

You can hear this line at 00:40:53.386 in the Blu-ray version of the movie.

Quote context

[...]

- The heavyweight champion of the world, Sonny Liston, weighing 218 pounds.

- Slip on out of here, Sonny. No telling what Clay's going to pull.

- No. I'm gonna wait on that faggoty nigger.

- Get my evil eye, stare him down, the same way as I done Patterson.

- I've come to destroy Sonny Liston!

- The world's gonna know how great I am. People think I'm just talking. They call me a big mouth. After this, you're gonna see... I am the greatest! I am the greatest!

- Tell the whole world. Tell the world. I'm the man. I'm the man. I'm the greatest. I'm the greatest.

- I am the champ. I'll destroy that sucker. I'm the greatest. I'm the greatest. He'll fall right away. I'm the greatest. I'm the greatest.

- All of them are gonna miss him.

- Sucker, there he is. There he is, talking. You don't scare me. You don't scare me. You don't scare me.

[...]