Doctor: 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! Now please stop bothering me. - THE TIME MEDDLER.
Doctor: My dear Steven, history sometimes gives us a terrible shock and that is because we don't quite fully understand. Why should we? After all, we're too small to realise its final pattern. Therefore, don't try and judge it from where you stand. I was right to do as I did. Yes, that I firmly believe. Steven... Even after all this time, he cannot understand. I dare not change the course of history. Well, at least I taught him to take some precautions - he did remember to look at the scanner before he opened the doors. And now, they're all gone. All gone. None of them could understand. Not even my little Susan. Or Vicki. And as for Barbara and Chatterton — Chesterton — they were all too impatient to get back to their own time. And now, Steven. Perhaps I should go home. Back to my own planet. But I can't... I can't... - THE MASSACRE.
Doctor: I can feel it... it's got something... sort of powerful... it's... Look at my skin! Look at that! I've got that prickling sensation. The... sensation again... the same... just as I had when I fought the Daleks... those Daleks were near! - THE WAR MACHINES.
Here's a pair of similar quotes from a pair of somewhat similar stories.
THIRD DOCTOR: ... my people are very keen to stamp out unlicensed time travel. You can look upon them as galactic ticket inspectors, if you like. - "The Time Warrior"
FOURTH DOCTOR: Well, you see, that's a great pity because I can't allow you to interfere with Earth's progress... It's part of a Time Lord's job to insist on justice for all species. - "The Masque of Mandragora"