- Rodrigo Borgia: [Referring to Cesare] ... nobody knows what he's going to do next.
- Vanozza Cattaneo: Have you tried talking to him?
- Rodrigo Borgia: We never see him to talk to him.
- Vanozza Cattaneo: Have you tried forgiving him?
- Rodrigo Borgia: For what?
- Vanozza Cattaneo: Whatever lies between you two!
- Rodrigo Borgia: And what's that?
- Vanozza Cattaneo: Well, only you two know.
- Vanozza Cattaneo: That's the trouble. You're too alike.
- Rodrigo Borgia: Mmmm. The trouble is I miss him.
- Mattai the Hebrew: [to Gamaliel about his affecting appearing to be a Christian] I serve a Christian Pope so you can remain a Jew.
- Mattai the Hebrew: [to Rodrigo trying to reconcile father and son] He is made in your image!
- Rodrigo Borgia: [He mutters] We don't know that! He is me! All the fire, the fury, the drive... the pitiless ambition! I look into his eyes - I see myself!
- [Yelling rhetirically]
- Rodrigo Borgia: Do you expect me to love that?
- Cesare Borgia: I'm certain! I can't understand why you don't share my certainty!
- Rodrigo Borgia: Certainty is the preserve of youth.