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
No one ever won a game by resigning.
A Queen's sacrifice, even when fairly obvious, always rejoices the heart of the chess-lover.
It's always better to sacrifice your opponent's men
It is said that an ounce of common sense can outweigh a ton of 'variations'.