It must be so. I cannot be mistaken. Yet... Your eyes. Your eyes have become empty as Lir's, as any eyes that... never saw unicorns.

King Haggard (Christopher Lee)

16 seconds sound clip from the The Last Unicorn movie soundboard.

You can hear this line at 01:13:16.258 in the Blu-ray version of the movie.

Quote context

[...]

- You are the last.

- My lord, I do not understand. I see nothing at all in the water!

- Do you still deny yourself? Do you dare still pretend to be human?

- I'll hurl you down to the others with my own hands if you dare deny yourself!

- What are you saying?

- It must be so. I cannot be mistaken. Yet... Your eyes. Your eyes have become empty as Lir's, as any eyes that... never saw unicorns.

- It makes no difference. I can wait. The end will be the same. I can wait.

- He is mad! Mad!

- Shhh, don't, don't, don't. It's all right. We'll find them. Come on, come to me.

- Oh, please, please don't cry. If you've become human enough to cry then no magic in the world can change you back.

[...]