Victoria: "How old?"
2nd Doctor: "Well, if we count in Earth terms, I suppose I must be about four hundred... yes, about four hundred and fifty years old!" (The Tomb of the Cybermen)

2nd Doctor: "Oh, I used my own special technique-- ... keeping my eyes open and my mouth shut." (The Tomb of the Cybermen)

2nd Doctor: "No, of course not, but a... but a... but a whole galaxy to explore? Millions of planets? Eons of time? Countless civilizations to meet?" (The War Games)

2nd Doctor: "Well, yes, it's quite close, isn't it? (He sees the Brigadier looking around the console room in disbelief). Oh you'll soon get used to it, old chap. Relative dimensions and all that."
Brigadier: "So this is what you've been doing with UNIT funds and equipment all this time. How's it done, some sort of optical illusion?"
2nd Doctor: "Oh, no, no, no. They come like this, really." (The Three Doctors)

Jamie: "Try to give us a smooth take-off, Doctor. We don't want to frighten her."
2nd Doctor: "A smooth take-off? A smooth take-off?!?! What a nerve!" (Tomb of the Cybermen)

Jamie: "Och, the king of the beasties himself couldna get out of that one." (The Tomb of the Cybermen)

Victoria: "What are all these knobs?"
2nd Doctor: "What, these?"
Jamie: "Instruments. These are for controlling our flight."
Victoria: "Flight???"
Jamie: "Well, yes. You see, we travel around in here through time and space." (Victoria Laughs) (Tomb of the Cybermen)