Since it was for Rome it cannot be your defeat.
2 seconds sound clip from the The Fall of the Roman Empire (1964) movie soundboard.
You can hear this line at 01:59:24.200 in the Blu-ray version of the movie.
Quote context
[...]
- Livius. Oh, Livius. You have won. We have won.
- We have won the Senate. We have yet to win Rome.
- Rome is with you. The army's with you. I'll be with you.
- March against Commodus. With you as Caesar all Rome will change.
- You've defeated me. Haven't you?
- Since it was for Rome it cannot be your defeat.
- It is all so very clear now why you came... To destroy me.
- If you will try to oppose the will of the Senate...
- I will not oppose the will of the Senate. We'll allow your barbarians to settle, but you...
- You are no longer second in command to Caesar.
[...]