"They say the first sign of madness is talking to oneself."
- 7th Doctor to 5th and 6th Doctors, "The Sirens of Time"

"Shoot at anything that moves. If it doesn't move, shoot at it until it does."
- Lethbridge-Stewart, "Devil Goblins From Neptune." (NOVEL)

"I know that free movement in time and space is a scientific dream I don't expect to find solved in a junkyard."
- Ian Chesterton on the TARDIS, "An Unearthly Child."

"So, free will is not an illusion after all."
- 3rd Doctor, "Inferno."

"Of course we should interfere! Always do what you're good at!"
- 4th Doctor to Romana "Nightmare of Eden."

"There are some corners of the universe which have bred the most terrible things. Things that fight against everything we believe in. They must be fought."
- 2nd Doctor, "The Moonbase."

"It's my fantasy. I can rearrange the universe if I want to!"
- 9th Doctor

"Planets come and go, stars perish, matter disperses, coalesces, forms into other patterns, other worlds. Nothing can be eternal."
- 6th Doctor, "Mysterious Planet."

"I don't believe that man was made to be controlled by machines. Machines can make laws but they can not preserve justice.
Only human beings can do that."
- 1st Doctor, "Keys of Marinus."

"We shall play endless games together...your brain against mine."
- The Celestial Toymaker, "The Celestial Toymaker."

"One good solid hope is worth a cartload of certainties."
- 4th Doctor, "Warriors Gate"

"The nature of man even in this day and age hasn't altered at all. You still fear the unknown like everyone else before you."
- Steven, "The Ark"

"With proof, you don't need to believe."
- Tomas, "The Face of Evil"

"People spend all thier time making nice things and then other people come along and break them."
- 2nd Doctor, "Enemy of the World."

And the half time score: Perivale six hundred million; Rest of the Universe, nil."
- Ace, "Curse of Fenric."

"What does it do, Doctor?" - Steven
"That is the dematerializing control and that over yonder is the horizontal hold. Up there is the scanner, those are the doors, that is a chair with a panda on it. Sheer poetry, dear boy."
- 1st Doctor
"The Space Museum"

"A man is the sum of his memories, you know? A Time Lord even more so."
- 5th Doctor, "The Five Doctors"

"I stowed his remains carefully for the trip home because, even in death, I didn't trust him."
- 8th Doctor on the Master, "The Enemy Within." (TVM)

"Logic, dear Zoe, merely enables one to be wrong with authority."
- 2nd Doctor, "Wheel In Space."

"I can hear the sound of empires toppling."
- 7th Doctor, "Happiness Patrol."

"Our lives are important - at least to us - and as we see, so we learn... Our destiny is in the stars, so let's go and search for it."
- 1st Doctor, "The Reign of Terror."

"Overweight, underpowered museum piece... Might as well try and fly a second-hand gas stove."
- The Master, on the Doctor's TARDIS, "The Claws of Axos."

"If we fight like animals we die like animals."
- 7th Doctor, "Survival."

"It can do many things, Lesterson. But the thing it does most efficiently is exterminate human beings."
- 2nd Doctor on the Daleks, "Power of the Daleks"

"Courage isn't just a matter of not being afraid. It's being afraid and doing what you have to do anyway."
- 3rd Doctor, "The Planet of the Daleks."

"Circular logic will only make you dizzy, Doctor."
- Peri, "The Two Doctors."

"It's an emergency program. In the case of an impending collision the TARDIS automatically dematerializes on the nearest stable position in time and space." - 5th Doctor
"Why didn't you tell us this before?" - Tegan
"It never worked before." - 5th Doctor,
"Terminus"

"One day we'll know all the mysteries of the skies and we will stop our wanderings."
- Susan, "Marco Polo"

"You know, I don't think these cows know anything about the time scanner."
- 4th Doctor, "Image of the Fendahl"

"Sometimes I travel so fast I don't exist."
- Ace, "Curse of Fenric."

"The Doctor's almost as clever as I am."
- Zoe, "Krotons."

"For someone so small, you take up lots of space."
- 6th Doctor to the 7th, "Sirens of Time"

"Only a fool argues with his Doctor."
- 7th Doctor, "Rememberance of the Daleks."

"The centuries that divide me shall be undone."
- Scarlioni the Jagaroth, "City of Death."

"It's always the innocent bystanders who suffer."
- Master, "Colony in Space."

"There's nothing ONLY about being a girl."
- Sarah Jane Smith, "Monster of Peladon."

"You can't rule the world in hiding. You've got to come out onto the balcony sometime and wave a tentacle."
- 4th Doctor, "Terror of the Zygons."

"And now they've all gone...none of them could understand. Not even my little Susan, or Vicki...and as for Barbara and Chatterton ... Chesterton ... they were all to impatient to get to thier own time. Perhaps I should go home, back to my own planet... But I can't..."
- 1st Doctor, "Massacre."