“Don't interfere!" The Doctor silenced her angrily. "I cannot will my own destruction.”

“By the way," said Tegan, suddenly very self-conscious. "Thank you." "What?" "You were prepared to give up everything for us." The Doctor just smiled and stood up. "Oh, come on!”

“The bemused Brigadier shook his head. "You and that TARDIS.”

“I'm hard to get rid of." He smiled. All Tegan's suspicions about the boy came flooding back. "So it seems," she replied icily.”

“Mawdryn stared at the Brigadier with such a look of pain and longing. For a moment the old soldier's mind went back thirty-five years to his first taste of action as a young lieutenant in Palestine, with his platoon badly shot up by terrorists, and he remembered the mangled conscript who screamed at the officer to take his rifle and kill him.”

“The Brigadier had no wish to shake hands with the improbable young man in the ridiculous frock-coat.”

“Passion, you see, can be destroyed by a doctor. It cannot be created.”