Play e4 or do not play e4. There is no trying e4. --- Adoy Siliov
What is your favorite chess quote?

- The most powerful weapon in chess is to have the next move
- Chess is, above all, a fight.
- The beauty of a move lies not in its appearance but in the thought behind it. - Aaron Nimzowitsch

Another quote: "Chess, like love, is infectious at any age."--Salo Flohr
Well, I guess better infectious than infected.

amateurs practice till they get it right, professionals practice till they cant get it wrong
I like this one too. But I don't think it was first said as a chess quote. I think it originally was said by a choir master. But I could easily be wrong.

"It's going to be an interesting fight for second place." Fischer on his thoughts upon entering a tournament.
"When I play chess and have the white pieces, I win because I have white. When I have the black pieces, I win because I am Bogolyubov."
Here's one:

"I think of branching of chess variations in a typical game as being fractal (i.e. self-similar) and resembling natural systems such as snowflakes, trees and coastlines. Like these natural systems chess is extremely complex in its design and solving it by brute force will require not only quantum computing but also brilliant minds." - Iryna Zenyuk (aka Energia)
Any opening is good enough if its reputation is bad enough. --Alekhine?
Good quote. I like it!