->'''Time Agent 1:''' Captain, why did you take the ''Defiant'' back in time?\\
'''Sisko:''' It was an accident.\\
'''Time Agent 1:''' So you're not contending it was a predestination paradox?\\
'''Time Agent 2:''' A time loop - that you were meant to go back into the past?\\
'''Sisko:''' No.\\
'''Time Agent 1:''' Good.\\
'''Time Agent 2:''' We hate those.
-->-- ''Series/StarTrekDeepSpaceNine'', "Trials and Tribble-ations"

->'''Vanderbeam''': Wait! Where did you get [[TimeMachine this]]? I was too late to steal it!
->'''Vanderbeam''': I used this suit to steal the one I just gave to you.
->'''Vanderbeam''': But... then where did you get the one you're wearing?
->'''Vanderbeam''': My future self handed it to me two decades ago.
-->-- ''{{Starslip}}''

->'''Nagato''': Since there's no conclusion to the paradox theory, there's no way to prove there's no paradox.
->'''Kyon''': Maybe that's a good enough explanation for ''[[SufficientlyAdvancedAlien you]]''...
-->--''LightNovel/HaruhiSuzumiya'': Bamboo Rhapsody

->The idea here is that you can travel back in time, but you can't actually change history. So if you go back and try to prevent the assassination of [[UsefulNotes/WilliamMcKinley President McKinley]], it turns out that you killed him yourself. Or if you go back and try and prevent the Black Plague, it turns out that ''you'' are a [[TomatoInTheMirror flea-ridden diseased rat]].
-->--'''Lore Sj÷berg''', "Alt Text"

-->-- '''[[color:#008282:gallowsCalibrator/Terezi Pyrope]]''', ''Webcomic/{{Homestuck}}''

->''In fact that was even ''more'' puzzling, when Harry thought about it. Time had presented him with the finished Prank as a ''fait accompli'', and yet it was, quite clearly, his own handiwork. Concept and execution and writing style. Every last part, even the ones he still didn't understand.''
-->-- FanFic/HarryPotterAndTheMethodsOfRationality

->'''Idris:''' House eats [=TARDISes=].\\
'''The Doctor:''' House what? What do you mean?\\
'''Idris:''' I don't know, something I heard you say.\\
'''The Doctor:''' When?\\
'''Idris:''' In the future.\\
'''The Doctor:''' "House eats [=TARDISes=]"?\\
'''Idris:''' Oh! There you go.
-->-- ''Series/DoctorWho'', "The Doctor's Wife"

->''I am the Bad Wolf. I create myself. I take the [[ArcWords words]]... I scatter them. Across time and space. My message to lead myself here.''
-->-- '''Rose Tyler''' / '''The TARDIS''', "The Parting of the Ways"

->'''Goliath:''' If I didn't fear the damage you would do to the time stream, I would gladly leave you here.\\
'''Xanatos:''' But you won't, because you didn't. Time travel is funny that way.
-->-- ''WesternAnimation/{{Gargoyles}}''

->'''[[KidFromTheFuture Pierce]]''': "I don't believe you, causality is--\\
'''Volair''': Pick a number between ten and oh, sixteen.\\
'''Pierce''': Uh, twelve. Now--\\
'''Volair''': How old were you when I suddenly decided to paint the kitchen green?\\
'''Pierce''': Twel-- (look of sudden realization). Urk. Uh. muhh.. fuh..\\
'''Rhonda''': Told ya.
-->-- ''Webcomic/UmlautHouse''

->''"Don't do anything that affects '''anything''', unless it turns out [[YouAlreadyChangedThePast you were supposed to do it]], in which case, for the love of God, don't '''[[ConfusingMultipleNegatives not]]''' do it!"''
-->-- '''Professor Farnsworth''', ''WesternAnimation/{{Futurama}}'', "Roswell That Ends Well"

->''"Well, I guess that wraps everything up in a nice, [[TemporalParadox paradox]]-free bow"''
-->-- '''Professor Farnsworth''', ''WesternAnimation/{{Futurama}}'', "Bender's Big Score"

->'''1971 Robo:''' You're going to learn the ''hell'' out of hyperdimensional mathematics when you get back. Focus on electrodynamics.\\
'''1926 Robo:''' Why?\\
'''1957 Robo:''' So we'll know how to convert these burnt out powerpacks into a hyper-dimensional bomb to blow up the monster across multiple simultaneous points in space-time.\\
'''1926 Robo:''' How'd you know they burned out?\\
'''2009 Robo:''' Because we just ''told'' you, so you'll ''remember'' they are, so we can ''tell'' you they are. ''Dah!'' Study temporal mechanics while you're at it. Short version: when your future self tells you to do something, ''you do it.''
-->-- ''ComicBook/AtomicRobo and the Shadow from Beyond Time''

->''"No one can unmake the past. It's already happened, there's no 'undo'. Similarly, the future already happened. We just haven't '''reached''' it yet."''
-->--'''Sarda The [[AWizardDidIt Wizard Who Did It]]''', ''Webcomic/EightBitTheater'', "[[http://www.nuklearpower.com/2009/06/04/episode-1136-that-is-not-a-predictive-model/ That Is Not A Predictive Model]]"

->''"Though we can move through time, time itself is unmovable."''
-->-- '''[[spoiler: Young Xehanort]]''', ''VideoGame/KingdomHearts3DDreamDropDistance''

->If I ever invent a time machine, I'm going to stay as far away from myself as possible. If I were to have a conversation with myself, wouldn't I have to remember it perfectly, or else my memory of the conversation would be different from the actual conversation and it could result in a paradox that could destroy the universe? Unless, of course, I don't remember the conversation well enough to remember what future me was/is supposed to say. I guess my point is, don't go visit yourself yesterday. Wait a decade or two.
-->-- ''Webcomic/BobAndGeorge'' (author's commentary)