Lasker thought that his rationalism rendered him immune from the surprises of chess theory.
To avoid losing a piece, many a person has lost the game
The winner is the one who makes the next-to-last mistake.
Some part of a mistake is always correct
No one ever won a game by resigning.
A Chess game is divided into three stages: the first, when you hope you have the advantage, the second when you believe you have an advantage, and the third... when you know you're going to lose!