Denna quotes from Legend of the Seeker

Denna

Pain is the one experience common to every living thing. It unites us. Mord-Sith are taught to use pain, to channel it, control it, just as you are learning.

Denna

Did you not feel my Agiel? The harder you fight, the more painful its magic will become. And after I've finished training you with it, you'll do anything to please me. Anything. And nothing will please me more than to see the Seeker, stand at the gates of the People's Palace, and there, before the multitudes, take the hand of Lord Rahl and pledge his undying love and fealty to him.

Richard Cypher

I'm going to take that Sword, and I'm going to kill him with it. After I kill you.

Denna

I do enjoy a challenge. Shall we begin?

Richard Cypher

Mistress Denna, would you allow Constance to train me tomorrow?

Denna

[beating him] Why are you asking for Constance!? You prefer her touch to mine? Obviously I've been too easy on you! Why do you ask for her? Answer me!

Richard Cypher

Because it hurts you to use the Agiel. I don't want you to suffer any more because of me.