So I'm a bit of a philosophy buff. I find myself mostly aligned with existential/absurdist thought, but I always enjoy coming across those quotes that make you think a littler deeper. I'll give a couple of my favorites, please pile on.
"Only those who attempt the absurd will achieve the impossible." - M C Escher
"Speaking and writing is an ever renewed struggle to be both apposite and intelligible, and every word that is finally uttered is a confession of our incapacity to do better; but each time we have finished saying something and let it stand, we tacitly imply also that this says what we mean and should mean it therefore also to the listener or reader." - Michael Polanyi
"Don't believe everything you read on the internet." - Abraham Lincoln
"I believe I am right. Or, if not right, at least plausible."
- Ignatius Donnelly
"Never attribute to malice that which is adequately explained by stupidity."
- 'Hanlon's Razor', Robert J. Hanlon
"I love Food And Stuff. It's where I buy all of my food. And most of my stuff."
- Ron Swanson
"90% of everything is crap" - Sturgeon's law
"What we do for ourselves dies with us. What we do for others and the world remains and is immortal." - Albert Pine
No greater love hath a man than he lay down his life for his brother."
"Not for millions, not for glory, not for fame--for one person, in the dark, where no one will ever know or see." John 15:13 added onto by Sebastian (Babylon 5)*
*= I actually used this in a game once.
I'm a big fan of G. K. Chesterton. He's got a knack for turning conventional wisdom and common knowledge on its head.
"Tradition means giving votes to the most obscure of all classes, our ancestors. It is democracy of the dead. Tradition refuses to submit to the small and arrogant oligarchy of those who merely happen to be walking about. All democrats object to men being disqualified by the accident of birth; tradition objects to them being disqualified by the accident of death."
"People accuse Mr. Shaw and many much sillier persons of 'proving that black is white.' But they never ask whether the current colour-language is always correct... Now, it is undoubtedly true that if a man asked a waiter in a restaurant for a bottle of yellow wine and some greenish-yellow grapes, the waiter would think him mad. It is undoubtedly true that if a Government official, reporting on the Europeans in Burma, said, 'There are only two thousand pinkish men here' he would be accused of cracking jokes, and kicked out of his post. But it is equally obvious that both men would have come to grief through telling the strict truth."
"Protection, therefore, against the tyranny of the magistrate is not enough: there needs protection also against the tyranny of the prevailing opinion and feeling; against the tendency of society to impose, by other means than civil penalties, its own ideas and practices as rules of conduct on those who dissent from them; to fetter the development, and, if possible, prevent the formation, of any individuality not in harmony with its ways, and compel all characters to fashion themselves upon the model of its own. There is a limit to the legitimate interference of collective opinion with individual independence: and to find that limit, and maintain it against encroachment, is as indispensable to a good condition of human affairs, as protection against political despotism." - John Stuart Mill
"Aint it funny how it is...you never miss it till its gone away" ~ Steve Harris
"Because we don't know, we get to think of life as an inexhaustible well. Yet everything happens only a certain number of times, and a very small number really. How many more times will you remember as certain afternoon of your childhood, some afternoon that's so deeply a part of your being that you can't even conceive of your life without it? Perhaps 4 and 5 times more. Perhaps not even. How many more times will you watch the full moon rise? Perhaps 20. And yet it all seems limitless." ~James Bowles
"Without music to decorate it, time is just a bunch of boring production deadlines or dates by which bills must be paid."
~Frank Zappa
"There is only one god and his name is Death. And there is only one thing we say to death: not today." ~ George RR Martin
"I like reality. It tastes of bread." - Jean Anouilh
"When you meet a master swordsman, show him your sword. When you meet a man who is not a poet, do not show him your poem." - Lin Chi
"If you cannot find the truth right where you are, where else do you expect to find it?" - Dogen