"Listen, here's the thing. If you can't spot the sucker in the first half hour at the table, then you ARE the sucker." - Mike McDermott, "Rounders"
[Poker] exemplifies the worst aspects of capitalism that have made our country so great. ~Walter Matthau
Hold em is to stud what chess is to checkers. ~Johnny Moss
Cards are war, in disguise of a sport. ~Charles Lamb
Nobody is always a winner, and anybody who says he is, is either a liar or doesn't play poker. ~Amarillo Slim
Poker's a day to learn and a lifetime to master. ~Robert Williamson III
God does not play dice with the universe; He plays an ineffable game of his own devising, which might be compared, from the perspective of any of the other players [i.e., everybody], to being involved in an obscure and complex version of poker in a pitch-dark room, with blank cards, for infinite stakes, with a Dealer who won't tell you the rules, and who smiles all the time. ~Terry Pratchett and Neil Gaiman, Good Omens, 1991
Feel free to add your favorite quotes in the comments.