Perhaps one of the most popular~ "I am just here for the chess dudes"- 2Q1C
Greatest Quotes of Chess.com

"I saw the title. I was vaguely interested.
I saw who posted it. I was hooked.
I saw it was not a troll thread. (Or at least not a very obi ours one). I was disappointed.
I expected better Macer. I expected better."
-vicountvonjames

And this one by Ziryab is one of the best chess quotes I've heard: "Thousands of blitz games made me an expert. If I wouldn't have played them, probably I'd be a master".

These are not great quotes, just some popular quotes.
"Hmm" - @IAMBBW
"Say Hello in the my blog Hello!" - @Firefly_2010
"SHOCKING! HAAAAAAA" - @Smositional

And this one by Ziryab is one of the best chess quotes I've heard: "Thousands of blitz games made me an expert. If I wouldn't have played them, probably I'd be a master".
Nice one!

"A cheater is just a loser pretending to be a winner" - @Elisabeth13
Post your greatest quotes you have heard on chess.com!