- Dr. McCoy: There's a line from Shakespeare...
- Captain Kirk: Yes, Bones, I remember it: "How sharper than a serpent's tooth it is to have a thankless child."
- Mr. Spock: Indeed, Captain.
- Kukulkan: You still are children to me, to be led and shown how to live.
- Captain Kirk: But if children are made totally dependent on their teachers, they will never be anything but children.
- Kukulkan: Enough! This is useless! Despite what I have shown you, you still cling to your disobedient ways! My dream is ending and all of you are to blame!
- Captain Kirk: Mr. Walking Bear, do the legends say what happened to Kuklekan?
- Walking Bear: No, sir. Only that he left and promised one day to return.
- Captain Kirk: Then that space probe that approached Earth must have been his.
- Dr. McCoy: Good heavens! This is a Capellan power-cat. No one's ever been able to keep one alive.
- Captain Kirk: Why, Bones?
- Dr. McCoy: They hate captivity. You try to put more than one hand on them and they throw off a charge of 2,000 volts.
- Dr. McCoy: How did you ever capture it?
- Kukulkan: It was an infant and easily controlled - as you were when I visited Earth.