- You shouldn't have done that, Remus.
- I know what should be done and what shouldn't be done. You keep out of this, Romulus.

9 seconds sound clip from the Duel of the Titans (Romulus and Remus) movie soundboard.

You can hear this line at 01:12:55.564 in the Blu-ray version of the movie.

Quote context

[...]

- If any man here refuses to sacrifice everything then he is a servant and a slave.

- Remus, a good leader does not speak that way.

- We want a city of our own, just like you do, Remus.

- But if we all should die in this headlong race what can we expect to build? A city of corpses?

- True, you are the one who is leading us. We agree, but you are an ambitious man, and often a cruel one.

- Be quiet, old man!

- You shouldn't have done that, Remus.

- I know what should be done and what shouldn't be done. You keep out of this, Romulus.

- There is only one leader here, me.

- That's a decision you made on your own.

- Our mother's dying wish was that we live in agreement, and together build the city.

- The gods have chosen me, and by the gods I'll convince you.

- If you're trying to provoke me, you won't succeed. I'd never fight my brother.

[...]