And yet, the answer is simple.

3 seconds sound clip from the The Fall of the Roman Empire (1964) movie soundboard.

You can hear this line at 01:53:52.039 in the Blu-ray version of the movie.

Quote context

[...]

- How costly that is! How wasteful!

- And yet the answer is simple. We must have no war.

- No war? When your friends continually attack us.

- This is treason!

- These people have proved their aims very clearly. To destroy us, and to destroy the whole Roman way of life.

- And yet, the answer is simple.

- Let us transform my friends from men of war to men of peace.

- Let us put them on our abandoned farmland. Not only will they produce food for themselves, but this I pledge you. One day they will send food to Rome.

- Yes, I agree! Put them on those lands. Let them produce for us, but as slaves. That is the way it has always been!

- Niger here used to have twenty thousand slaves on his family estate. Where are they now? All sold or freed. Why? Because Niger is opposed to slavery?

[...]