"Stupid, stupid, stupid," said the Doctor. "Why don't I listen to myself, when I know how clever I am?"
"What didn't you listen to?" asked Padme.
"I said it would probably take the Time Lords to have done this, didn't I?" He could speak freely because he had rejoined Padme in the brig.
"The Time Lords? But you said Time Lords aren't supposed to interfere in history."
"That's a half-truth, notwithstanding that even most Time Lords believe it. I learned differently when I first wore the Presidential link to the matrix data bank. The true cause of the Time Lords is to preserve history.
"In fact, future Federation archaeologists in stumbling across some of our more primitive artifacts have taken to calling us 'Preservers' ..."