The Unicorn and Schmendrick's last conversation:
Unicorn: You are a true wizard now, as you always wished. Does it make you happy?
Schmendrick: Well, men don't always know when they're happy. But I... I think so. And you?
Unicorn: I am a little afraid to go home. I have been mortal, and some part of me is mortal yet. I am no longer like the others, for no unicorn was ever born who could regret, but now I do. I regret.
Schmendrick: I am sorry. I have done you evil and I cannot undo it.
Unicorn: No. Unicorns are in the world again. No sorrow will live in me with that joy... save one. And I thank you for that part, too.