If we do that, all the unicorns in the world will remain prisoner forever except one, and she will grow old and die.
7 seconds sound clip from the The Last Unicorn movie soundboard.
You can hear this line at 01:21:43.749 in the Blu-ray version of the movie.
Quote context
[...]
- I heard what you said. I will go no further.
- There's no choice. We have to go on.
- The Red Bull has no care for human beings. We may walk out past him and get away.
- Lir, I will not love you when I am a unicorn.
- Then let the quest end here.
[...]