But I tell you this: There is a great truth we have not yet divined.

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

You can hear this line at 01:03:31.837 in the Blu-ray version of the movie.

Quote context

[...]

- A year. What is a year to you?

- Coarse, vulgar, stupid thing.

- Yet it was I who said, is it not in the nature of the fig tree to give figs, as for the honey bee to give honey, and for the lion who fall upon the lamb?

- So it is in the way of things that you should come for me.

- Forgive me, Boatman. I did not realize you were blind and deaf. Come for me when you will. My hand shall lead us.

- But I tell you this: There is a great truth we have not yet divined.

- Oh, it is you Cleander.

- Is there something I can do, my lord Caesar?

- I'm in pain.

- The Greeks say there is nothing better than fruit to soften pain.

[...]