From Wikipedia, I found some amusing aphorisms by Tartakower,
Savielly Tartakower (1887–1956) was a leading Polish and French chess Grandmaster, who has been credited with the following quotations:

(1) "It's always better to sacrifice your opponent's men."
(2) "An isolated pawn spreads gloom all over the chessboard."
(3) "The blunders are all there on the board, waiting to be made."
(4) "The winner of the game is the player who makes the next-to-last mistake."
(5) "It is not enough to be a good player; you must also play well."
(6) "The move is there, but you must see it." (Horowitz 1971:137)
(7) "No game was ever won by resigning."
(8) "I never defeated a healthy opponent." This quotation refers to players who blame an illness, sometimes imaginary, for their loss.
(9) "Tactics is knowing what to do when there is something to do. Strategy is knowing what to do when there is nothing to do."
(10) "Moral victories do not count."
(11) "Chess is a fairy tale of 1001 blunders."
(12) "The great master places a Knight on e5; checkmate follows by itself."
(13) "Every chessplayer should have a hobby"
(14) "A game of chess is divided into three stages: the opening, where you think you might be better; the middlegame, where you hope you might better;
and the ending, where you know you have lost."

I can identify with both #5 and #14, which of these aphorisms do you relate to?